List of acronyms: 0–9
This is a list of acronyms and initialisms.
For the purpose of this list, an acronym is an abbreviation that is pronounced as a series of constituent letters, and an initialism is an abbreviation whose pronunciation is wholly or partly the names of constituent letters. Also, a pseudo-blend is an abbreviation that is not really an acronym, nor an initialism nor a true portmanteau word, usually due to extra or omitted letters.
- (a) = acronym in the example: SARS - (a) Severe acute respiratory syndrome
- (i) = initialism in the example: CD - (i) Compact disc
- (p) = pseudo-blend in the example: UNIFEM - (p) United Nations Development Fund for Women
Add new entries here
Please add your own, in a quasi-dictionary order with lowercase treated the same as uppercase. This means that only alphanumeric characters are significant to determine the order, and that lowercase letters occupy the same ordering position as uppercase. For example: Algol appears before ALS. This differs from a strict ASCII ordering.
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Non-alphabetic
0-9
- 2D - (i) Two-dimensional
- 2.5D - (i) "Two-and-a-half-dee": two-dimensional computer graphics imitating 3D
- 2G - (i) Second-generation mobile (cellular, wireless) telephone system
- 2.5G - (i) Second-and-a-half-generation mobile telephone system
- 3D - (i) Three-dimensional
- 3G - (i) Third-generation mobile telephone system
- 3M - (i) Minnesota Mining and Manufacturing Company
- 4D - (i) Four-dimensional (usually three spatial plus one temporal dimension, sometimes 4 spatial ones)
- 4G - (i) Fourth-generation mobile telephone system
- 4GL - (i) Fourth-generation programming language
- 4WD - (i) Four wheel drive (cf. AWD)
A
- A4 - (i) many, including a European standard office paper size; see entry
- AA - (i) Alcoholics Anonymous - Automobile Association
- AAA - (p) American Automobile Association ("Triple-A") - anti-aircraft artillery
- AAD - (i) analogue analogue digital - Australian Antarctic Division
- AARP - (i) formerly American Association of Retired Persons, but now officially known only by the initials
- AAS - (i) American Astronomical Society; pronounced "Double-A S"
- ABA - (i) American Bar Association / American Basketball Association / Australian Broadcasting Authority
- ABB - (i) ASEA Brown Boveri (Swiss-Swedish multinational company)
- ABBA - (a) Agneta, Benny, Björn, Anni-Frid (the Swedish pop group)
- ABC - (i) alcoholic-beverage commission - alien big cat - Always Be Careful - American-Born Chinese - American Broadcasting Company - anti-lock brake controller - Associated British Corporation - Atanasoff Berry Computer - Atlantic Baptist College - Atomic Biological Chemical (see NBC) - Australian Broadcasting Corporation
- ABET - Accreditation Board for Engineering and Technology
- ABLE - (a) Airborne law enforcement (police air support unit)
- ABM - (i) anti-ballistic missile - Asynchronous Balanced Mode - automated banking machine
- ABN - (i) Australian Business Number - a number issued by the Australian government as registration of a business (used for taxation purposes)
- ABS - (i) acrylonitrile butadiene styrene - anti-lock braking system
- AC - (i) adriamycin-cyclophosphamide (chemotherapy) - alternating current - Anonymous Coward - ante christum - air conditioning - Albert Champion - Associazione Calcio (Italian, "football (soccer) club")
- ACC - (i) Automatic Climate Control / Atlantic Coast Conference
- ACCAC - (a) Awdurdod Cymwysterau, Cwricwlwm ac Asesu Cymru (Qualifications, Curriculum and Assessment Authority for Wales)
- ACE - (a) Automatic Computing Engine - Air Combat Emulator (computer game)
- ACES - (a) Aerolineas Centrales de Colombia
- ACF - (i) American Culinary Federation
- ACK - (p) Acknowledge (telecommunications) (cf. NAK)
- ACL - (i) Access Control List / anterior cruciate ligament
- ACLU - (i) American Civil Liberties Union
- ACM - (i) see entry
- ACN - (i) Australian Company Number - a number issued by the Australian government as registration of a company (limited liability) in Australia.
- ACORN - (i) Association for Community Organizations Reform Now
- ACS - (i) American Chemical Society, American Cancer Society, Association of Caribbean States, Affiliated Computer Services (NYSE ACS)
- ACTU - (i) Australian Council of Trade Unions
- AD - (i) Latin, Anno Domini ("In the year of our Lord")
- ADA - (i) American Dental Association / Americans with Disabilities Act (but see also the similar, but non-acronymic, Ada as in Ada programming language)
- ADC - (i) Apple Display Connector
- ADD - (i) analogue digital digital - Attention-Deficit Disorder
- ADP - (i) Adenosine diphosphate
- ADHD - (i) Attention-Deficit Hyperactivity Disorder
- ADHS - (i) attention-deficit hyperactivity syndrome
- ADL - (i) Anti-Defamation League
- ADM - (i) Archer Daniels Midland
- ADS - (a/i) Astrophysics Data System - Attention Deficit Syndrome
- ADT - (i) Atlantic Daylight Time (UTC-3 hours)
- AEF - (i) American Expeditionary Force
- AFAIC - (i) As far as I'm concerned
- AFAICT - (i) As far as I can tell
- AFAIK - (i) As far as I know
- AFAIR - (i) As far as I remember/recall
- AFC - (i) American Football Conference - Asian Football Confederation
- AFJ - (i) April Fool's Joke
- AFK - (i) Away from keyboard (Internet chat abbreviation)
- AFL - (i) American Federation of Labor - American Football League - Arena Football League - Australian Football League
- AG - (i) Aktiengesellschaft (German for incorporated)
- AGA - (a/i) AB Gas-accumulator ("ah-gah", Swedish company) - Advanced Graphics Architecture
- AGB - (i) Internal Nintendo initialism for Game Boy Advance.
- AGC - (i) Apollo Guidance Computer - Automatic Gain Control
- AGM - (i) Annual General Meeting
- AGP - (i) Accelerated Graphics Port
- AI - (i) Amnesty International - Artificial insemination - Artificial intelligence
- AIA - (i) Aerospace Industry Association
- AIC - (i) African Independent Church
- AICMFP - (i) and I claim my five pounds
- AIDS - (a) Acquired Immune Deficiency Syndrome
- AIM - (i) many, including AOL Instant Messenger; see entry
- AIPAC - (i) American Israel Public Affairs Committee
- aka - (i) also known as
- AKDT - (i) Alaska Standard Daylight Saving Time (UTC-8 hours)
- AKST - (i) Alaska Standard Time (UTC-9 hours)
- AL - Anno Lucis, the "Year of Light" in Masonic tradition. Most often seen on plaques bearing the founding dates of buildings, in years AD and years AL.
- ALAP - (a) as long/late as possible
- ALGOL - (a) Algorithmic language
- ALS - (i) Amyotrophic lateral sclerosis
- AM - (i) many, including Amplitude modulation; see entry
- AMA - (i) American Medical Association
- AMD - (i) Advanced Micro Devices (U.S. company)
- AMP - (i) Adenosine monophosphate
- AMRAAM - (a) Advanced Medium-Range Air-to-Air Missile
- AMS - (i) American Mathematical Society
- ANA - (a) All Nippon Airways, anti-nuclear anti-body
- ANC - (i) African National Congress
- ANSI - (a) American National Standards Institute
- ANZAC - (a) Australian and New Zealand Army Corps
- AOL - (i) America Online
- AP - (i) Associated Press - Advanced Placement
- APB - (i) All points bulletin (police jargon)
- apm - (i) Advanced Power Management
- ARSC - (i) Artic Region Supercomputing Center.
- ASA - (i) Acetesalicylic acid - American Standards Association - Army Security Agency - Atlantic Southeast Airlines
- ASAP - (a) as soon as possible
- ASCAP - (a) American Society of Composers, Authors, and Publishers
- ASCC - (i) Automatic Sequence Controlled Calculator
- ASCII - (a) American Standard Code for Information Interchange
- ASDF - (i) Attack, Sustain, Decay, Release (sound envelope specification)
- ASEAN - (i) Association of Southeast Asian Nations
- ASFAR - (a) Americans for a Society Free of Age Restrictions
- ASIC - (a) Application-specific integrated circuit
- ASICS - (a) Latin, Anima Sana In Corpore Sano ("A Sound Mind in a Sound Body") (athletic shoe manufacturer)
- ASIO - (i) Australian Security Intelligence Service
- ASL - (i) American Sign Language
- ASP - (i) Active Server Pages - Application Service Provider (cf ISP)
- ASRAAM - (a) Advanced Short-Range Air-to-Air Missile
- AST - (i) Atlantic Standard Time (UTC-4 hours)
- ASTREA - (a) Aerial support to regional enforcement agencies (sheriff's air support unit)
- ATAS - (a) Air-to-Air Stinger (missile)
- ATB - (i) Active Time Battle.
- ATM - (i) automated teller machine - asynchronous transfer mode - at the moment
- ATP - (i) Adenosine triphosphate
- AT&T - (i) American Telephone and Telegraph (U.S. company, aka "Ma Bell")
- ATI - (i) Allied Telesyn International, Inc.
- ATV - (i) All-Terrain Vehicle
- AUC - (i) Latin, Ab Urbe Condita ("from the founding of the city") / Anno Urbis Conditae ("in the year since the founding of the city") (of Rome) - Area Under the Curve (concentration time curve; medicine)
- AVI - (i) Audio Video Interleave
- AVO - (i) Apprehended Violence Order
- AWACS - (a) Airborne Warning and Control System
- AWD - (i) many, including all wheel drive; see entry
- AWOL - (a) Absent Without Official Leave - Absent w/o Leave (military jargon)
- AYU - (i) As Yet Unknown
B
- B2B - (i) Business-to-business electronic commerce
- B2C - (i) Business-to-consumer electronic commerce
- B2E - (i) Business-to-employee electronic commerce
- B&W - (i) black and white - Babcock & Wilcox - Bowers & Wilkins
- BAR - (a) British American Racing - Browning Automatic Rifle - Buy-American restrictions
- BART - (a) Bay Area Rapid Transit
- BASE - (a) as in BASE jumping - Building, Antenna, Span, Earth(form)
- BASF - (i) Badische Anilin und Soda Fabrik (German chemicals company)
- BASIC - (a) Beginner's All-purpose Symbolic Instruction Code, acronym was added later, originally it was simply Basic
- BATF - (i) U.S. Bureau of Alcohol, Tobacco, and Firearms
- BB - (i) Brigitte Bardot (actress) - Boys' Brigade (Christian youth organisation)
- BBB - (i) blood-brain barrier - Better Business Bureau
- BBC - (i) British Broadcasting Corporation
- BBQ - (i) Barbeque
- BC - (i) Before Christ - Before Common era - Blind Copy (in emailers) - British Columbia - Boston College
- BCC - (i) Blind Carbon Copy
- BCCI - (i) Board of Control for Cricket in India
- BCD - (i) Binary-coded decimal
- BCE - (i) Before Common Era - British Columbia Electric - Banque Centrale Européenne
- BCER - (i) British Columbia Electric Railway
- BCPL - (i) BCPL programming language (progenitor of C)
- BCS - (i) Bowl Championship Series (US college football)
- BDA - (i) British Dental Association
- BDFL - (i) Benevolent Dictator For Life
- BDNF - (i) Brain-derived neurotrophic factor
- BDOS - (a) Basic disk operating system; part of CP/M
- BDU - (i) battle-dress uniform
- BFE - (i) Beyond/Butt/Bum F*****' Egypt (colloquial for "quite far away")
- BIOS - (a) basic input/output system
- BIST - (a) Built-in self-test
- BIT - (i) Bilateral Investment Treaty - Built-in test
- BJT - (i) bipolar junction transistors
- BLUI - (a/i) Body Language User Interface
- BME - (i) Biomedical Engineering
- BMI - (i) Broadcast Music Incorporated - Body mass index
- BMW - (i) Bayerische Motoren Werke / Bavarian Motor Works
- BMX - (i) Bicycle/Bike Moto(r) Cross
- BNF - (i) Backus-Naur Form (computing)
- BNS - (i) Bank of Nova Scotia
- BNSF - (i) Burlington Northern Santa Fe
- BO2K - (i) Back Orifice 2000
- BOAC - (i) British Overseas Airways Corporation (predecessor of British Airways)
- BOAT - (a) Byway Open to All Traffic (pronounced as 2 syllables, "Bo-At")
- BODMAS - (a) Brackets, Of, Division, Multiplication, Addition, Subtraction
- BOFH - (i) Bastard operator from hell
- BOGOF - (a) Buy one, get one free
- BOHICA - (a) Bend Over Here It Comes Again
- BOP - (i) Balance of Payments
- BOT - (i) Balance of Trade
- BP - (i) British Petroleum (today, BP doesn't officially stand for everything)
- BPM - (i) Beats Per Minute
- BRB - (i) "be right back" (Internet chat abbreviation)
- BRFSS - (i) Behavioral Risk Factor Surveillance System (a CDC health survey covering the US and US territories; pronounced "BURF us")
- BSA - (i) Boy Scouts of America - Birmingham Small Arms (motorcycles company)
- BSD - (i) Berkeley Software Distribution (distinct from BSoD)
- BSE - (i) Bovine Spongiform Encephalopathy, better known as Mad Cow disease
- BSL - (i) British Sign Language
- BSoD - (i) Blue screen of death (distinct from BSD)
- BSP - (i) Between-show Promotion - Binary Space Partitioning - Board Support Packages - (p) Business Sponsored
- BST - (i) Binary search tree - Blended Sales Tax - Bovine somatotropin - British Summer Time
- BT - (i) British Telecommunications plc
- BTO - (i) Built to Order
- BTU - (i) British thermal unit
- BTW - (i) By the way
- BWARS - (a) Bees, Wasps & Ants Recording Society
- BWR - (i) boiling-water reactor
- BYOB - (i) Bring your own beverages/bottle
- BYOC - (i) Bring your own computer. Play on BYOB.
- BYU - (i) Brigham Young University
C
- CAC - (i) California Association of Criminalists
- CAD - (a) Computer Aided Design - computer aided dispatch
- CAIR - (i) Council on American-Islamic Relations
- CALABARZON - (p) a region in the Philippines: Cavite, Laguna, Batangas, Rizal, Quezon (not an acronym in the strictest sense)
- CAMRA - (a) The Campaign for Real Ale
- CANDU - (p) from "Canada Deuterium Uranium", a nuclear reactor design
- CARE - (a) Cooperative for Aid and Relief Everywhere (originally C.A.R.E. - Cooperative for American Remittances to Europe)
- CAW - Canadian Auto Workers trade union
- CB - (i) citizens' band radio
- CBE - (i) Commander of the Order of the British Empire
- CBC - (i) Canadian Broadcasting Corporation - Cipher Block Chaining
- CBM - (i) many, including Canadian Baptist Ministries and Commodore Business Machines; see entry
- CBT - (i) Cognitive behavior therapy
- CC - (i) many, including carbon copy; see entry
- CCCP - (i) Cyrillic for SSSR (Union of Soviet Socialist Republics) - Central Committee of the Communist Party
- CCD - (i) charge-coupled device
- CD - (i) many, including Compact disc; see entry
- CDC - (i) Centers for Disease Control and Prevention - Control Data Corporation
- CDF - (i) California Department of Forestry and Fire Protection
- CE - (i) [many meanings, including Christian/Common Era (cf. AD); see entry]
- CENTO - (a) Central Treaty Organization (Baghdad Pact)
- CEO - (i) Chief executive officer
- CEPT - (a/i) Conference Européenne des administration des Postes et des Télécommunications (European Conference of Postal and Telecommunications Administrations)
- CERN - (a) Centre Européen pour la Recherche Nucléaire
- CERT - (a) Computer Emergency Response Team
- cf. - (i) Latin, confer ("compare", or "see also")
- CFA - (i) Cat Fanciers' Association - Chartered financial analyst - Colour filtering array - Country Fire Authority
- CFG - (i) Context-free grammar - Control flow graph
- CFO - (i) Chief financial officer
- CFSP - (i) Common Foreign and Security Policy
- CGT - (i) Capital gains tax
- CHP - (i) California Highway Patrol
- CIA - (i) Central Intelligence Agency - Culinary Institute of America
- CIB - (i) Complete in box (of items on Internet auction/trading listings)
- CIBC - (i) once the Canadian Imperial Bank of Commerce
- CICS - (a) Customer Information Control System (IBM mainframe software)
- CID - (i) Criminal Investigations Department
- CIO - (i) Chief information officer - Congress of Industrial Organizations
- CIS - (i) Commonwealth of Independent States (former Soviet Union) - Canadian Interuniversity Sport
- CISB - (i) Complete in sealed box (of items on Internet auction/trading listings)
- CIWS - Close-in weapon system
- CJ - (i) Criminal Justice
- CJC - (i) Canadian Jewish Congress
- CLEC - (i) Competitive Local Exchange Carrier
- CLEMARS - (a) California Law Enforcement Mutual Aid Radio System
- CLI - (i) command line interface/interpreter
- CMHC - (i) Canada Mortgage and Housing Corporation
- CMM - (i) Capability Maturity Model
- CMOS - (i) complementary metal-oxide-semiconductor - Canadian Meteorological and Oceanographic Society
- CMR - (i) Coaxial Main Rotors (helicopter type)
- CMYK - (i) cyan magenta yellow key (colour model)
- CN - (i) Canadian National
- CND - (i) Campaign for Nuclear Disarmament
- CNN - (i) Cable News Network - Cellular nonlinear network
- CNR - (i) Canadian National Railway
- CO - (i) many, including Central Office (phone company); see entry
- c/o - (i) care of (postal code indicating temporary address change)
- COBOL (a) - Common Business-Oriented Language
- COD - (i) cash on delivery
- COLA - (a) cost of living adjustment - comp.os.linux.announce
- CONCACAF - (a) Confederation of North, Central American and Caribbean Association Football
- CONMEBOL - (p) Confederación Sudamericana de Fútbol (South American Football Confederation)
- CPA - (i) Certified Public Accountant
- COSER - (i) COoperative SERvice
- CPAC - (i) Conservative Political Action Conference - Canadian Parliamentary Affairs Channel
- CPPCC - (i) Chinese People's Political Consultative Conference
- CPR - (i) Canadian Pacific Railway
- CPSU - (i) Communist Party of the Soviet Union
- CPU - (i) central processing unit
- CQD - (i) come quick, distress (?)
- CRC - (i) Christian Reformed Church - Cyclic redundancy check - Chemical Rubber Company
- CREB - (a) Cyclic AMP-response element binding (protein)
- CREEP - (a) Committee to Re-elect the President
- CRM - (i) Customer Relationship Management
- CRT - (i) cathode ray tube - Chinese remainder theorem
- CRTC - (i) Canadian Radio-television and Telecommunications Commission
- CSA - (i) Confederate States of America - Canadian Standards Association - Canadian Space Agency - Child Support Agency - Czech Airlines - Community-supported agriculture
- CSI - (i) see entry
- CSICOP - (i) Committee for the Scientific Investigation of Claims of the Paranormal
- CSIS - (i) Canadian Security Intelligence Service - Center For Strategic & International Studies
- CSS - (i) Cascading Style Sheets - content-scrambling system - cross site scripting - Confederate States Ship
- CTO - (i) Chief technical officer
- CTSS - (i) Compatible Time-Sharing System
- CUNY - (a) City University of New York (usually pronounced "CUE-knee")
- CUPE - (i) Canadian Union of Public Employees
- CUPW - (i) Canadian Union of Postal Workers
- CV - (i) many, including curriculum vitae (resumé); see entry
- CVR - (i) Cockpit voice recorder
- CVS - (i) Concurrent Versions System
- CWC - (i) Chemical Weapons Convention
D
- D&D - (i) Dungeons and Dragons.
- DAQ - (p) Data acquisition
- DART - (a) Dublin Area Rapid Transit
- DASL - (i) DASL programming language Datapoint's Advanced Systems Language
- d/b/a - (i) doing business as
- DBE - (i) Dame Commander of the Order of the British Empire
- DC - (i) da capo - Italian Democrazia Cristiana - direct current - District of Columbia - Douglas Aircraft Company - Dublin Core - duty cycle
- DD - (i) many, including dear daughter (increasingly prevalent on social mailing lists, blogs, and bulletin boards); see entry
- DDA - (i) digital differential analyzer
- DDD - (i) digital digital digital (CD mastering) - Data Display Debugger
- DDoS - (i) distributed denial of service
- DDR - (i) Dance Dance Revolution - Deutsche Demokratische Republik (East Germany, English abbr.: GDR, qv.) - Double Data Rate
- DDS - (i) Doctor of Dental Surgery
- DDT - (i) dichloro-diphenyl-trichloroethane (insecticide) - Dynamic Debugging Tool (computing)
- DEA - (i) Drug Enforcement Agency
- DEC - (a/i) Digital Equipment Corporation - Disasters Emergency Committee - Department of Environmental Conservation
- DECT - (a) Digital European Cordless Telephone
- DH - (i) Designated hitter - dear husband (increasingly prevalent on social mailing lists, blogs, and bulletin boards)
- DHS - (i) Department of Homeland Security.
- DHSS - (i) Department of Health and Social Security
- DIMM - (a) Dual In-line Memory Module (computing)
- DINK - (a) Double income, no kids
- DIY - (i) do it yourself
- DMA - (i) direct memory access (computing)
- DMD - (i) Doctor of Dental Medicine
- DMT - (i) Dimethyltryptamine
- DMV - (i) Department of Motor Vehicles
- DMZ - (i) demilitarized zone
- DNA - (i) DeoxyriboNucleic Acid - Douglas Adams
- DND - (i) Do Not Disturb - Department of National Defense
- DOA - (i) Dead On Arrival - Dead or Alive
- DOI - (a) Digital Object Identifier
- DOM - (i) Document Object Model
- DOS - (a) Density of State - Disk Operating System - Denial of Service (DoS, cf. DDoS)
- DPCO - (i) double-pole change over
- DPDT - (i) double-pole double-throw
- DPRK - (i) Democratic People's Republic of Korea
- DPST - (i) double-pole single-throw
- DRA - (i) Democratic Republic of America
- DRAM - (a) dynamic random access memory ("dee-ram") (computing)
- DRC - (i) Democratic Republic of the Congo
- DREA - (i) Defense Research Establishment Atlantic
- DRL - (i) daytime running lights - Dorman Roberts Ltd.
- DSRV - (i) Deep Submergence Rescue Vehicle - Deaf Sports Recreation Victoria
- DS - (i) dear husband, dear daughter, dear son (increasingly prevalent on social mailing lists, blogs, and bulletin boards)
- DTE - (i) Down to earth, or Data Terminal Equipment
- DTL - (i) diode-transistor logic (electronics)
- DTRA - (i) Defence Threat Reduction Agency
- DIP - (a) dual in-line package (electronics)
- DUI - (i) Driving Under the Influence - Data Use Identifier - Data Use Institute - Davis Unified Ignition - Diving Unlimited International - Documento Único de Identidad - Documento Unico de Importación - Duke University Improv
- DVD - (i) Digital Versatile Disk (was Digital Video Disk)
- DVM - (i) Doctor of Veterinary Medicine
- DWI - (i) Driving While Intoxicated/Impaired - Dance With Intensity - Danish West Indies - Diffusion-weighted imaging - Direct water injection - Disaster Welfare Inquiry - Drinking Water Inspectorate
E
- E3 - (i) Electronic Entertainment Expo and other meanings, see entry
- EAFUS - (i) "Everything" Added to Food in the United States (FDA list)
- EBCDIC - (a/i) Extended Binary Coded Decimal Interchange Code (pronounced "eb-see-dik") (cf. BCD)
- EBE - (i) extraterrestrial biological entity
- EBW - (i) exploding bridgewire
- ECL - (i) emitter coupled logic (electronics)
- ECS - (i) Extended Chip Set (computing)
- ECT - (i) Electroconvulsive therapy
- EDS - (i) Electronic Data Systems
- EEC - (i) European Economic Community (predecessor of the EU, qv.)
- EEG - (i) Electroencephalogram
- EFF - (i) Electronic Frontier Foundation
- e.g. - (i) example gratis (Latin, roughly "for example", "for instance")
- EKG - (i) Electrocardiogram (from German, Elektrokardiogramm)
- ELF (sometimes pronounced "elf") - (i) Earth Liberation Front - Endangered Language Fund - Eritrean Liberation Front - Executable and Linkable Format - Extremely Low Frequencies
- EMF - (i) electromotive force
- EMO - (i) emergency-measures organisation
- EMP - (i) electromagnetic pulse
- EMT - (i) emergency medical technician
- ENE - (i) east northeast
- EPCOT - (a) Experimental Prototype Community of Tomorrow
- EPL - (i) English Premier League
- ERA - (i) earned run average - Engineering Research Associates - Equal Rights Amendment
- ERCIM - (i) European Research Consortium for Informatics and Mathematics
- ESA - (i) European Space Agency
- ESE - (i) east southeast
- ESP - (i) Extra-Sensory Perception
- ESU - (i) Emergency services unit
- ETA - (i) estimated time of arrival - Euzkadi Ta Azkatasuna
- etc - (i) latin "et cetera" (and remaining)
- ETLA - (i) Extended TLA
- EU - (i) European Union
- EULA - (i) End-User License Agreement
- EVA - (i) extra-vehicular activity
F
- FAAQ - (i) Frequently Asked and Anticipated Questions (cf. FAQ)
- FAD - (i) Flavin adenine dinucleotide
- FAO - (i) Food and Agriculture Organization
- FAQ - (a/i) Frequently Asked Questions (sometimes pronounced "fak")
- FARC - (a) Fuerzas Armadas Revolucionarias de Colombia (Revolutionary Armed Forces of Colombia)
- FASEB - (i) Federation of American Societies for Experimental Biology
- FBI - (i) Federal Bureau of Investigation
- FCC - (i) Federal Communications Commission
- FCM - (i) Fogarty's Cove Music - Federation of Canadian Municipalities
- FDA - (i) Food and Drug Administration (U.S.)
- FDR - (i) Franklin Delano Roosevelt - Flight data recorder
- FEMA - (a/i) Federal Emergency Management Agency
- FF - (i) Final Fantasy
- FFT (i) Fast Fourier Transform - Final Fantasy Tactics
- FIDE - (a) The Fédération Internationale des Échecs (World Chess Foundation)
- FIFA - (a) Fédération Internationale de Football Association (International Association Football Federation)
- FIFO - (a) First In First Out
- FIS - (a/i) Federation Internationale de Ski (International Ski Federation)
- FIU - (i) Florida International University
- FLAC - (a/i) Free Lossless Audio Codec.
- FLIR - (i) forward looking infrared (sensor)
- FLK - (i) Funny-Looking Kid (medical diagnosis in-joke)
- FM - (i) frequency modulation (electronics)
- FMSF - (i) False Memory Syndrome Foundation
- Fortran - (p) Formula Translator (programming language)
- FPS - (i) First person shooter (computer/video games) - frames per second (motion pictures, television, computer graphics)
- FQDN - Full Qualified Domain Name
- FSC - (a) Forest Stewardship Council (an ecological pressure group)
- FSF - (i) Free Software Foundation
- FST - (i) Finlands Svenska Television (Finland's Swedish-language television)
- FTC - (i) Federal Trade Commission
- FTL - (i) Faster Than Light
- FTP - (i) File Transfer Protocol
- FTSE - (a/i) Financial Times Stock Exchange (pronounced "footsie")
- FUBAR - (a) Fucked (or Fouled) Up Beyond All Recognition
- FUD - (a) Fear, Uncertainty & Doubt (marketing strategy)
- FWI - (i) French West Indies
- FWIW - (i) For What It's Worth
- FYI - (i) For Your Information
- FYROM - (i) Former Yugoslav Republic of Macedonia
G
- G3 - (i) many, including Heckler und Koch G3; see entry
- G4 - (i) Generation Four PowerPC microprocessor
- G5 - (i) Generation Five PowerPC microprocessor
- GABA - (i) Gamma-aminobutyric acid
- GAD - (a) Generalized Anxiety Disorder
- GBE - (i) Knight/Dame Grand Cross of the Order of the British Empire
- GCD - (i) see entry
- GCF - (i) greatest common factor
- GDP - (i) gross domestic product
- GDR - (i) German Democratic Republic (cf. DDR)
- GE - (i) General Electric - Genetic Engineering (cf. GM)
- GEOS - (i) Graphical Environment Operating System
- Gestapo - (p) GEheime STAatsPOlizei ("secret state police")
- GEV - (i) Ground Effect Vehicle - Giga Electron-Volt (spelled GeV).
- GFCI - (i) ground fault circuit interrupter (aka GFI)
- GFDL - (i) GNU Free Documentation License
- GFI - (i) ground fault interrupter (aka GFCI)
- GFY - (i) Internet chat acronym, "good for you", or "go fuck yourself", depending on the context
- GHB - (i) gamma-hydroxybutyrate
- GI - (i) Galvanised Iron - General Issue - Government Issue - Gastro-intestinal
- GIF - (a) Graphics Interchange Format
- GIGO - (a) Garbage In Garbage Out
- GIMP - (a) GNU Image Manipulation Program
- GL - (i) Grenade Launcher - Graphics Language
- GLUT - (a/i) OpenGL Utility Toolkit.
- GLAAD - (a) Gay and Lesbian Alliance Against Defamation
- GM - (i) GameMaster (role-playing terminology) / Genetically Modified / General Motors / Guru Meditation
- GmbH - (i) Gesellschaft mit beschränkter Haftung (German, roughy "Inc" or "Ltd")
- GMO - (i) Genetically modified organism
- GMT - (i) Greenwich Mean Time
- GNOME - (a) GNU Network Object Model Environment
- GNU - (a) GNU's Not Unix
- GOMER - (a) Get Out of My Emergency Room (derogatory reference to hypochondriac patients)
- GOP - (i) Grand Old Party (United States Republican Party)
- GPG - (i) GNU Privacy Guard
- GPIB - (i) General-Purpose Instrumentation/Interface Bus
- GPL - (i) General Public License
- GPS - (i) Global Positioning System
- GRAS - (i) Generally Regarded as Safe (FDA list)
- grep - (a) (search) globally for regular expression, print (lines)
- GSOH - (i) Good sense of humour
- GST - (i) Goods and Services Tax (in Canada, Australia, etc
- GT - (i) Gran Turismo - Grand Touring
- GUI - (a) Graphical User Interface (pronounced goo-ey)
- Gulag - (p) Glavnoe Upravlenie ispravitel'no-trudovykh LAGerei
- GUT - (i) grand unification theory
H
- HAI - (a) Human Awareness Institute
- HALO - (a) High Altitude Low Opening (type of a parachute jump)
- HCF - (i) highest common factor
- HDD - (i) hard disk drive - high-density disk
- HEPA - (i) High-efficiency particulate air (filter)
- Hg - (i) Mercury (element)
- Hird - (a) Hurd of interfaces representing depth (cf. HURD)
- HIV - (i) Human Immunodeficiency Virus
- HKS - (i) hyperkinetic syndrome
- HLA - (i) Human leukocyte antigen - High level architecture
- HLL - (i) high-level language
- HMCE - (i) Her Majesty's Customs and Excise
- HMCS - (i) Her/His Majesty's Canadian Ship
- HMO - (i) Health Management Organization
- HMP - (i) Her/His Majesty's Prison
- HMS - (i) Her/His Majesty's Ship (see Royal Navy)
- HMSO - (i) Her/His Majesty's Stationery Office
- HMV - (i) His Master's Voice
- HP - (i) Hewlett-Packard - horse power
- HP-GL - (i) Hewlett-Packard Graphics Language
- HP-IB - (i) Hewlett-Packard Instrument/Interface Bus (first implementation of GP-IB, later standardised and now known as IEEE-488)
- HP-IL - (i) Hewlett-Packard Interface Loop (serial bus used with some HP calculators and computers, notably the HP-41 and HP-71 series)
- HPV - (i) Human papilloma virus
- HQ - (i) Headquarters
- HRH - (i) Her/His Royal Highness
- HSS - (i) High-Speed Steel
- HST - (i) see entry
- HSV - (i) herpes simplex virus - hue saturation value (colour model)
- HTML - (i) Hypertext Markup Language
- HURD - (a) Hird of Unix-Replacing Daemons (cf. Hird)
- HVP - (i) hydrolized vegetable protein - HarborView Properties - High Vacuum Process
- HW - (i) hardware
I
- IAAF - (i) International Association of Athletics Federations
- IAAL - (i) I am a lawyer
- IAEA - (i) International Atomic Energy Agency
- IAF - {i} Industrial Areas Foundation
- IAI - (i) International African Institute - Israel Aircraft Industries
- IANA - (i) Internet Assigned Numbers Authority
- IANAL - (i) I am not a lawyer
- IATA - (a/i) International Air Transport Association
- ICAO - (i) International Civil Aviation Organization
- ICBM - (i) intercontinental ballistic missile
- ICBN - (i) International Code of Botanical Nomenclature
- ICC - (i) International Criminal Court
- ICD - (i) Implantable cardioverter-defibrillator - International Classification of Diseases
- ICHTHYS - (a) Iesous Christos, Theou Yios, Soter (Greek for "Jesus Christ, Son of God, Savior")
- ICP - (i) Insane Clown Posse - inductively coupled plasma
- ICZN - (i) International Code of Zoological Nomenclature
- IDF - (i) Israel Defence Forces
- i.e. - (i) id est (Latin, roughly "that is")
- IE - Internet Explorer - Indo-European
- IED - (i) Improvised Explosive Device
- IEEE - (i) Institute of Electrical and Electronics Engineers (pronounced "I triple-E")
- IETF - (i) Internet Engineering Task Force
- IFO - (i) Identified flying object
- IHR - (i) Institute for Historical Review
- IIRC - (i) If I recall/remember correctly
- IIT - (i) Indian Institutes of Technology
- ILC - (i) International Law Commission
- ILO - (i) International Labour Organisation
- IMF - (i) International Monetary Fund
- IMHO - (i) In My Humble Opinion
- IMO - (i) International Maritime Organization - In My Opinion
- IMRI - (i) Industrial Membrane Research Institute - Information Management Research Institute - International Market Research Information - Institut pour le Management de la Recherche et de l'Innovation - intraoperative magnetic resonance imaging
- INC - (i) Iraqi National Congress
- INLA - (i) Irish National Liberation Army
- INRI - (a/i) Iesus Nazarenus Rex Iudæorum (Latin, "Jesus of Nazareth, King of the Jews")
- IP - (i) Intellectual property - Internet Protocol
- IPN - (i) Instytut Pamieci Narodowej (Institute for National Memory)
- IQ - (i) Intelligence Quotient
- IR - (i) Infrared
- IRA - (i) Individual Retirement Account (legally, Individual Retirement Arrangement) - Irish Republican Army
- IRBM - (i) intermediate Range Ballistic Missile
- IRC - (i) International reply coupon
- IRC - (i) Internet relay chat
- IRO - (i) International Refugee Organisation
- IRS - (i) Internal Revenue Service
- ISA - (i) Individual Savings Account - industry standard architecture - Instruction Set Architecture - International Seabed Authority
- ISAF - (a) International Sailing Federation - International Security Assistance Force
- ISCII - (a) Indian Standard Code for Information Interchange
- ISO - (i) In search of - International Organization for Standardization
- IT - (i) Information Technology
- ITN - (i) Independent Television News (British TV news company)
- ITS - (i) Incompatible Time-sharing System
- ITT - (i) International Telephone and Telegraph (US company)
- ITU - (i) International Telecommunication Union
- IUPAC - (a) International Union of Pure and Applied Chemistry (pronounced "eye-yoo-pac")
J
- JAG - (a) Judge Advocate General (US military lawyers)
- JAL - (a) Japan Airlines
- JAMA - (i) Journal of the American Medical Association
- JATO - (a) Jet Assisted Takeoff Unit
- JCS - (i) Joint Chiefs of Staff
- JDL - (i) Jewish Defense League
- Jeb Bush - (a) John Ellis Bush
- Jeb Stuart - (a) James Ewell Brown (Stuart's given names)
- JFK - (i) John Fitzgerald Kennedy or the airport named after him.
- JPEG - (a) Joint Photographic Experts Group
- JRA - (i) Japanese Red Army
- JW - (i) Jehovah's Witnesses
K
- KARNAC - (a) Knowledge Aided Retrieval in Activity Context
- KBE - (i) Knight Commander of the Order of the British Empire
- KCK - (i) Kansas City, Kansas
- KCMO - (p) Kansas City, Missouri (pronounced "K-C-Moe")
- KFC - (i) Kentucky Fried Chicken
- KGB - (i) Komitet Gosudarstvennoy Bezopasnosti (Committee for State Security - Soviet Intelligence Service)
- KIA - (i) Killed In Action
- KISS - (a) Keep it simple stupid
- KKK - (i) Ku Klux Klan
- KLM - (i) Koninklijke Luchtvaart Maatschappij (Royal Dutch Airlines)
- KMFDM - (i) Kein mitleid für die mehrheit, or "no pity for the majority" (band)
L
- LA - (i) Los Angeles
- LACMA - (i) Los Angeles County Museum of Art
- LAN - (a) Local Area Network
- LANL - (i) Los Alamos National Laboratory
- LARC - (a) Livermore Advanced Research Computer (cf. LLNL)
- Laser - (a) Light Amplification by Stimulated Emission of Radiation (cf. Maser)
- LATA - (i) Local Access Transport Area
- LabVIEW - (p) Laboratory Virtual Instrumentation Engineering Workbench
- LBGT - (i) Lesbian, Gay, Bisexual, Transgender
- LBJ - (i) Lyndon Baines Johnson - Lady Bird Johnson - Little Beagle Johnson (their dog) - Lightbulb joke
- LBNL - (i) Lawrence Berkeley National Laboratory
- LBS - Location-Based Services
- LBW - (i) leg before wicket
- LCD - (i) liquid crystal display
- LCM - (i) least common multiple
- LDAP - (a/i) Lightweight Directory Access Protocol (pronounced "ell-dap")
- LDS - (i) Latter Day Saint - Liberal Democracy of Slovenia
- LEC - (i) Local Exchange Carrier
- LED - (i) Light Emitting Diode
- LGB - (i) Lesbian, Gay, Bisexual
- LGM - (i) little green men
- LIFO - (a) Last in, first out
- LLC - (i) limited liability company
- LLNL - (i) Lawrence Livermore National Laboratory
- LLP - (i) limited liability partnership
- LMAO - (i) Laughing my a** off.
- LMS - (i) London Mathematical Society
- LNG - (i) liquefied natural gas
- LOL - (i) Laughing Out Loud
- LPG - (i) liquefied petroleum gas (cf. LNG)
- LRAD - (p) Long Range Acoustic Device
- LSD - (i) German, lyserg-saüre-dietylamid (lysergic acid diethylamide)
- LSE - (i) London School of Economics - London Stock Exchange
- LSI - (i) Large-Scale Integration
- LUCA - (a) Last Universal Common Ancestor
- LVEF - (i) Left ventricular ejection fraction
M
- MAA - (i) Mathematical Association of America
- MAD - (a) magnetic anomaly detector - mutual assured destruction
- MADD - (a) Mothers Against Drunk Driving - Myoadenylate deaminase deficiency
- MAO - (i) Monoamine oxidase
- Maser - (a) Microwave Amplification by Stimulated Emission of Radiation
- MASH - (a) mobile army surgical hospital
- MBE - (i) Member of the Order of the British Empire
- MBTA - (i) Massachusetts Bay Transit Authority
- MC - (i) Military Cross bravery award
- MCA - (i) MultiChannel Analyzer
- MCD - (i) minimal cerebral dysfunction
- MD - (i) Mentioned in Despatches, military
- MDF - (i) main distribution frame - medium-density fibreboard
- MDMA - (i) Methylenedioxy-methylamphetamine, also known as "Ecstasy"
- MECC - (a) Minnesota Educational Computing Consortium (or Corporation, sources differ)
- MEP - (i) Member of the European Parliament
- MG - (i) Machine gun - Morris Garage
- MHz - (i) Megahertz
- MIA - (i) Missing in action
- MIB - (i) Mint in box (of items on Internet auction/trading listings)
- MILF - (a) Mother I'd Like To Fuck, Moro Islamic Liberation Front
- MIMAROPA - (a) a region in the Philippines: Mindoro, Marinduque, Romblon, Palawan
- MIP - (a) Multiple Identity Poster
- MIRV - (a) Multiple independent reentry vehicle
- MIS - (a) Management Information Systems - Museum Information System
- MIT - (i) Massachusetts Institute of Technology; Milli Istihbarad Teskilati (Intelligence service of Turkey)
- MITS - (i) see entry
- MLA - (i) member of legislative assembly
- MLB - (i) Major League Baseball
- MLS - (i) Multiple Listing Service - Major League Soccer
- MMU - (i) Manned Maneuvering Unit
- MND - (i) Motor Neurone Disease
- MNT - (i) Molecular nanotechnology
- MO - (i) modus operandi
- MOFA (both i and a)- Ministry of Foreign Affairs of Japan
- MOF (both i and a)- Ministry of Finance
- Moe - Marvel of entertainment
- MOAB - (a) Massive Ordnance Air Blast (official) - mother of all bombs (slang)
- MoMA - (i) Museum of Modern Art
- MOPE - (a) Most Oppressed People Ever (politics)
- MP - (i) Member of Parliament - military police - magic points
- MPEG - (a) Motion Pictures (Coding) Experts Group
- MRI - (i) magnetic resonance imaging
- MS - (i) Master of Science - Microsoft (sometimes M$) - Multiple sclerosis
- MSG - (i) Monosodium glutamate
- MSIE - (i) Microsoft Internet Explorer
- MST - (i) Mountain Standard Time - Madison Symmetric Torus
- MST3K - (i) Mystery Science Theater 3000
- MTR - (i) Main and Tail Rotor (helicopter type)
- MTS - (i) Michigan Terminal/Timesharing System - multichannel television sound - Multi-Technical Services
- MTV - (i) Music TeleVision; MainosTeleVisio (Finnish commercial TV company)
N
- N/A - (i) not available / not applicable
- NAACP ("N double-A CP") - (i) National Association for the Advancement of Colored People
- NAAFI - (a) Navy, Army and Air Force Institute (British)
- NAIRU - (i) Non Accelerating Inflation Rate of Unemployment
- NAMBLA - (a) North American Man-Boy Love Association - National Associaton of Marlon Brando Look-Alikes
- NaN - (i) Not a Number (computing)
- NARAL - (a) National Abortion Rights Action League
- NASA - (a) National Aeronautics and Space Administration
- NASCAR - (a) National Association for Stock Car Auto Racing
- Nasdaq - (a) National Association of Securities Dealers Automated Quotations
- NATO - (a) North Atlantic Treaty Organisation - National Association of Theatre Owners
- NB - (i) nota bene - New Brunswick
- NBA - (i) National Basketball Association
- NBC - (i) Nuclear/Biological/Chemical - National Broadcasting Corporation
- NC - (i) network computer - non-consensual - normally closed - North Carolina
- NCAA - (i) ("NC double A") - National Collegiate Athletic Association
- NDP - (i) New Democratic Party
- NE - (i) northeast
- NET - (i) National Educational Television
- NFC - (i) National Football Conference
- NECTEC - (i) National Electronics and Computer Technology Center (Thailand)
- NFER - (i) National Foundation for Educational Research
- NFL - (i) National Football League
- Nfld - (i) Newfoundland
- NG - (i) natural gas - next generation
- NGO - (i) non-governmental organization
- NHANES - (i) National Health and Nutrition Examination Survey
- NHL - (i) National Hockey League
- NIAID - National Institute of Allergies and Infectious Disease
- NIB - (i) New in box (of items on Internet auction/trading listings)
- NICHD - National Institute of Child Health and Human Development[1]
- NIEHS - (i) National Institute of Environmental Health Sciences
- NIH - (i) National Institutes of Health - Not Invented Here
- NIMBY - (a) Not In My Back Yard
- NIMH - (i) National Institute of Medical Herbalists - National Institute of Mental Health
- NiMH - (i) nickel metal hydride (the lower-case "i" is the standard convention for this acronym in this context)
- NIN - (i) Nine Inch Nails (band)
- NIST - (i) National Institute of Standards and Technology
- NLP - (i) Natural Language Processing or Neuro-linguistic programming
- NMD - (i) National Missile Defense
- NNE - (i) north northeast
- NNW - (i) north northwest
- NO - (i) normally open - nitric oxide
- NOAA - (a) National Oceanic and Atmospheric Administration
- NORAD - (a) North American Aerospace Defense Command
- NUCC(C) - (a) Nordic University Computer Club (Conference)
- NORML - (a) National Organization for the Reform of Marijuana Laws
- NORWICH - (a) (k)Nickers Off Ready When I Come Home (British army slang written on letters home)
- NOS - (i) New old stock (of items on Internet auction/trading listings)
- NOTAFLOF - (a) No One Turned Away For Lack Of Funds
- NOW - (a) National Organization for Women
- NPC - (i) Non-Player Character (roleplaying terminology) / National Provincial Championship (New Zealand rugby competition)
- NPD - (i) Nationaldemokratische Partei Deutschlands (German)
- NPOV - (i) Neutral point of view
- NPR - (i) National Public Radio
- NRTA - (i) National Retired Teachers Association - National Rat Terrier Association - Northwest Regional Transmission Association - National Retail Tenants Association
- NSA - (i) National Security Agency
- NTSC - (i) National Television Standards Committee
- NUTS - (a) Nuclear Utilization Target Selection
- NW - (i) northwest
- NWFZ - (i) Nuclear-Weapons-Free Zone
- NYHA - (i) New York Heart Association
- NYRA - (i) National Youth Rights Association / (a) New York Racing Association (horse racing)
- NYSE - (i) New York Stock Exchange
- NYT - (i) New York Times
- NZ - (i) New Zealand
- NZC - (i) New Zealand Cricket
O
- OAC - (i) on approved credit
- OAU - (i) Organization for African Unity
- OBE - (i) Officer of the Order of the British Empire
- OCR - (i) optical character recognition
- OCS - (i) see entry
- OED - (i) Oxford English Dictionary
- OEM - (i) Original Equipment Manufacturer
- OJ - (i) orange juice / O. J. Simpson
- OO - (i) object oriented - over & out
- OOP - (i) object-oriented programming
- OOS - (i) Occupational overuse syndrome
- OPAC - (a) Online Public Access Catalogue
- OPEC - (a) Organisation of Petroleum Exporting Countries
- OPP - (i) Ontario Provincial Police
- OSI - (i) Office of Strategic Influence / Ontario Swine Improvement / Open Source Initiative / Open systems interconnect
- OSS - (i) Organization of Strategic Services (forerunner of CIA)
- OTOH - (i) On The Other Hand
P
- P2P - Peer to Peer (file sharing)
- PABX - (i) Private Automated Branch Exchange (company phone system)
- PAFC - (i) Plymouth Argyle Football Club
- Pakistan - (a) Punjab, Afghan States, Kashmir, Sindh, Baluchistan
- PAL - (a) Phase Alternating Line (TV standard) - Philippine Airlines
- PARC - (a) Palo Alto Research Center
- PARWIG - (a) Power Augmented Ram Wing in Ground (aeroplane wing shape)
- PATH - (a) Port Authority Trans Hudson
- PBS - (i) Public Broadcasting Service
- PBX - (i) Private branch exchange (company phone system)
- PC - (i) Personal Computer - Player Character (roleplaying) - Politically Correct / Political Correctness
- PCB - (i) see entry
- PCC - (i) Presidents Conference Committee
- PCMCIA - (i) Personal Computer Memory Card International Association - People Can't Memorise Computer-Industry Acronyms
- PCP - (i) phencyclidine - pneumocystis carinii pneumonia - probabilistically checkable proof
- PDA - (i) Public display of affection - personal digital assistant - push-down automaton
- PDF - (i) Portable Document Format
- PDN - (i) pull-down network
- PDQ - (i) pretty damn quick (?)
- PDRY - (i) People's Democratic Republic of Yemen
- PEBCAC - (a) Problem Exists Between Chair and Computer (IT helpdesk in-joke)
- PEBKAC - (a) Problem Exists Between Keyboard and Chair (ditto)
- PEO - (a/i) Professional Engineers Ontario
- PET - (a/i) positron emission tomography (as in PET scan) - Personal Electronic Transactor - Pierre Elliott Trudeau
- PETA - (a/i) pentaerythritol triacrylate - People for the Ethical Treatment of Animals - People Eating Tasty Animals
- PFLAG - (p) Parents and Friends of Lesbians and Gays
- PFO - (i) Pissed, Fell Over (medical diagnosis in-joke)
- PGP - (i) Pretty Good Privacy.
- PHP - (i) PHP: Hypertext Preprocessor
- PIN - (i) Personal Identication Number
- PINF - (i) People In Need Foundation (Czech charitable organization)
- PIPA - (i) Program on International Policy Attitudes
- PITA - (a) Pain In The Ass
- PLC - (i) (British) public limited company
- PLL - (i) Phase-locked loop (electronics)
- PLM - (i) Polarized light microscope - polarized light microscopy
- PLO - (i) Palestine Liberation Organization
- PLOKTA - (a) Press Lots of Keys to Abort
- PLUTO - (a) Pipe Line Under The Ocean
- PM - (i) Post Meridian - Prime Minister - phase modulation - Perry Mason
- PNAC - (i) Project for the New American Century
- PNG - (i) Portable Network Graphic - Papua New Guinea
- PNP - (i) Partido Nuevo Progresista - plug 'n' play - positive negative positive
- POG - (a) Passionfruit, Orange and Guava
- POP - (i) Point of Presence - Post Office Protocol
- Posh - (a) see Dubious entries
- POTS - (a) Plain Old Telephone Service (cf PANS - Pretty Advanced/Awesome Network Services)
- PPM - (i) Parts Per Million
- PPP - (i) Point-to-Point Protocol / Purchasing Power Parity
- PPQ - (i) Pulses Per Quarter used in Music programming, sequencers
- PPQN - (i) Pulses Per Quarter Note
- PRC - (i) People's Republic of China
- PS - (i) post scriptum
- PSA - (i) Prostate specific antigen - Production Services Association - Paralysis Society of America - Pharmaceutical Society of Australia - Public Service Association - Public Service Announcement - pressure-sensitive adhesive
- PSV - (i) Philips Sport Vereniging (Dutch for Philips Sports Union)
- PTA - (i) Parent-Teacher Association
- PTO - (i) please turn over - (a) Patent & Trademark Office
- PTUI - (a/i) ("pa-too-ey") plain-text user interface (cf CLI)
- PUG - (i) PET Users Group
- PUN - (i) pull-up network
- PVC - (i) permanent virtual circuit - polyvinyl chloride - premature ventricular contraction
- PWP - (i) Plot, What Plot? (in online fiction, especially fanfic or erotic fiction, to denote plotless, um, "feel-good" stories)
- PWR - (i) pressurized water reactor
- PY - (i) Portsmouth yardstick
Q
- Qantas - (a) Queensland and Northern Territory Aerial Services
- QC - (i) Queen's Counsel - quality control
- QCA - (i) Qualifications and Curriculum Authority - Quality Council of Alberta
- QCD - (i) quantum chromodynamics
- QDOS - (a) Quick and Dirty Operating System
- QED - (i) Latin "quid es demonstrata" (that proves it) - quantum electrodynamics
- QSL - (i) Québec sign language
- Quango - (a) (British Commonwealth) QUasi Autonomous Non-Governmental Organisation
- Quasar - (a) Quasi-stellar radio source
- qv - (i) Latin "quod vide" (which see)
R
- R2I - (i) Resistance to Interrogation
- RA - (i) right ascension
- RAC - (i) Royal Automobile Club (in the UK), renamed RAC plc in 2002
- Radar - (a) Radio detection and ranging
- RAF - (i) Royal Air Force; Red Army Faction
- RAM - (a) Random-access memory - Royal Air Maroc - Rolling Airframe Missile
- R&B - (i) Rhythm and Blues
- RBI - (i) Runs batted in
- RBOC - (a/i) Regional Bell operating company ("Baby Bell")
- RC - (i) see entry
- RCA - (i) Radio Corporation of America; Royal City Avenue (famous entertainment zone in Thailand)
- RCAF - (i) Royal Canadian Air Force
- RCCO - (i) Royal Canadian College of Organists
- RCMP - (i) Royal Canadian Mounted Police
- RCS - (i) Revision Control System
- RCT - (i) Randomized controlled trial
- RDDL - (i) Resource Directory Description Language
- REACT - (a) Remote Electronically Activated Control Technology
- REAM - (i) Retired Educators Association of Minnesota
- RFC - (i) Request for Comments; Royal Flying Corps (WWI precursor to RAF)
- RFID - (i) Radio frequency Identification
- RGB - (i) Red Green Blue (colour model)
- RGBI - (i) Red Green Blue Intensity
- RIAA - (i) Recording Industry Association of America
- RIF - (i) Reduction In Force (layoffs)
- RIP - (i) Rest in Peace - Latin: requiescant in pace
- RISD - (p) ("RIZ-dee") Rhode Island School of Design
- RMS - (i) Royal Mail Ship (eg RMS Titanic) - Root-mean-square - Richard M. Stallman - Rate-monotonic scheduling
- RNA - (i) Ribonucleic Acid
- ROC - (i) Republic of China
- ROFL(MAO) - (i) Rolling On the Floor Laughing (My A** Off)
- ROM - (a) Read-only memory; Royal Ontario Museum
- ROV - (i) remotely operated vehicle
- RP - (i) role-playing
- RPG - (i) role-playing game; Rocket Projectile Gun; Rocket Powered/Propelled Grenade
- RPL - (i) Reverse Polish Lisp
- rpm - (i) Revolutions Per Minute; Red Hat Package Manager
- RPN - (i) reverse Polish notation
- rps - (i) revolutions per aecond
- RRS - (i) Racing Rules of Sailing
- RRSP - (i) Registered Retirement Savings Plan (Canada; roughly equivalent to the IRA in the USA)
- RSI - (i) Repetitive strain injury
- RSJ - (i) Rolled Steel Joist, used in construction
- RSN - (i) Real Soon Now, coined by author Jerry Pournelle
- RSPCA - (i) Royal Society for the Prevention of Cruelty to Animals
- RSS - (i) Really Simple Syndication
- RSVP - (i) répondez s'il vous plait (please reply)
- RTF - (i) Rich Text Format
- RTFM - (i) Read the Fucking Manual
- RTL - (i) see entry
- RTS - (i) see entry
- RUC - (i) Royal Ulster Constabulary
- RWADA - (i) Resident Weighted Average Daily Attendance, a New York State term used in public education to indicate the size of a school district, i.e its number of students
S
- SA - (i) Sturmabteilung (Nazi Storm Detachment, forerunner and rival of SS, qv.)
- SAD - (i) Seasonal Affective Disorder
- SALT - (a/i) Strategic Arms Limitation Talks - Southern African Large Telescope
- SAM - (a) surface-to-air missile - sequential-access memory - Sociedad Aeronáutica de Medellín
- SAR - (i) Search and Rescue - Synthetic aperture radar - Special Administrative Region
- SARS - (a) Severe acute respiratory syndrome
- SAS - (i) Special Air Service - Scandinavian Airline Systems - Second Avenue Subway
- SAT - (i) formerly Scholastic Aptitude Test and Scholastic Assessment Test; now known solely by the initials
- SATB - (i) soprano alto tenor bass
- SAVAK - (a) Sazamane Etelaat va Amniate Kechvar (Iranian Security and Intelligence Service)
- SBC - (i) Single-board computer
- SBS - (i) Special Boat Service; Special Broadcasting Service
- SCAP - (a) Supreme Commander Allied Powers (Allied occupation of Japan)
- SCRAM - (a) safety control rod axe man
- SCSI- (a) (technically pronounced "scuzzy") - small computer system interface
- Scuba - (a) Self Contained Underwater Breathing Apparatus
- SD - (i) Sheriff's department
- SDI - (i) see entry
- SDP - (i) Social Democratic Party (European politics)
- SDRAM - (a) ("ess-dee-RAM") Synchronous dynamic random-access memory
- SE - (i) southeast
- SEATO - (a) Southeast Asian Treaty Organization
- SEC - (i) Securities and Exchange Commission / Southeastern Conference
- SECAM - (a) Systeme Electronique Couleur Avec Memoire (TV standard, cf NTSC, PAL)
- SETI - (a) Search for Extraterrestrial Intelligence
- SF - (i) San Francisco - science fiction
- SGML - (i) Standard Generalised Markup Language
- SI - (i) Système International - Socialist International - Sports Illustrated
- SIAM - (i) Society for Industrial and Applied Mathematics
- SIG - (a/i) Special Interest Group - .signature (a UNIX shell/internet standard file name)
- SIIT - (i) Saskatchewan Indian Institute of Technologies (university in Canada); Sirindhorn International Institute of Technology (university in Thailand); Stateless IP/ICMP Translation Algorithm
- SIMM - (a) single in-line memory module
- SIMPLE - (a) Satellite Interactive Multimedia Platform for Low-cost Earth Stations
- SIS - (i) Secret Intelligence Service (also known as MI6)
- SLA - (i) Symbionese Liberation Army
- SLORC - (a) The State Law and Order Restoration Council (of Burma)
- SLR - (i) Single-lens reflex (camera)
- SLT - (i) Solid Logic Technology (electronics)
- SMDR - (i) Station Message Detail Recording
- SMG - (i) Submachine gun
- SMU - (i) Southern Methodist University
- SMS - (i) many, including Short message service; see entry
- SNAFU - (a) Situation Normal—All Fouled/Fucked Up
- SNCF - (i) Société National des Chemins de Fer Français (French Railways)
- SNOBOL - (a) StriNg Oriented symBOlic Language
- SNRI - (i) Serotonin-norepinephrine reuptake inhibitor
- SNU - (a) Solar neutrino unit
- SO - (i) Signifigant other - sheriff's office
- SOB - (i) Son Of a Bitch
- SOCCSKSARGEN - (a) a region in the Philippines: South Cotabato, Cotabato, Sultan Kudarat, Sarangani, General Santos City (pronounced sock-sar-gen)
- SOE - (i) Special Operations Executive (WWII British organization) - Secret of Evermore
- SOL - (i) S**t Out of Luck
- Sonar - (a) Sound navigation and ranging
- SOV - (i) Single occupant vehicle
- SPCO - (i) single-pole change over
- SPD - (i) Shimano Pedaling Dynamics
- SPDT - (i) single-pole double-throw
- SPQR - (i) Senatus Populus Que Romanus ("The Senate and the People of Rome")
- SPST - (i) single-pole single-throw
- SRAM - (a) ("ess-ram") Static Random Access Memory
- SRB - (i) solid rocket booster
- SRBM - (i) Short-range ballistic missile (cf. IRBM, ICBM)
- SS - (i) Schutzstaffel (Nazi elite Praetorian guard) - U.S. Secret Service - Spanish ship - stainless steel - Stockholm Skins - Super Sport
- SSDD - (i) single-sided double-density (floppy disk) - same shit, different day
- SSNW - (i) same shit, new wrapping
- SSE - (i) south southeast - Streaming SIMD Extensions
- SSRI - (i) Social Systems Research Institute - Selective serotonin reuptake inhibitor
- SSW - (i) south southwest
- STOL - (i) Short Take Off and Landing
- STOVL - (i) Short Take Off and Vertical Landing
- STP - (i) standard temperature and pressure
- Stuka - (a) Sturzkampfflugzeug (German WWII dive bomber)
- SUB - (i) student-union building
- SUNY - (a) State University of New York (usually pronounced "SUE-knee")
- SUV - (i) Sport utility vehicle
- SVG - (i) Scalar Vector Graphics
- SVO - (i) subject, verb, object
- SW - (i) southwest
- SWF - (p) ("swiff") Shockwave Flash file
- SWAPO - (i) South West African People's Organization
- SWAT - (a) Special Weapons And Tactics
- SWOT - (a) Strengths, weaknesses, opportunities, threats
T
- TANJ - (a) There Ain't No Justice
- TANSTAAFL - (a) There Ain't No Such Thing As A Free Lunch (from Robert Heinlein)
- TARDIS - (a) Time And Relative Dimensions In Space (from Doctor Who)
- TATT - (i) Tired All The Time (medical diagnosis in-joke)
- TBA - (i) To be announced
- TBC - (i) To be confirmed
- TBD - (i) To be determined
- TCG - (i) Trusted Computing Group - Türkiye Cumhuriyeti Gemisi
- TCP - (i) Transmission Control Protocol - trichlorophenol
- TCU - (i) Texas Christian University
- TEAL - (a) Tasman Empire Airways Limited
- TEETH - (a) Tried Everything Else, Try Homeopathy (medical diagnosis in-joke)
- TGIF - (i) Thank God it's Friday
- TGV - (i) Train à Grande Vitesse (high-speed train) - Tanjong Golden Village - Test Generation with Verification
- TLA - (i) Three-Letter Abbreviation/Acronym
- TLC - (i) tender loving care - The Learning Channel - thin layer chromatography
- TLD - (i) top-level domain
- TM - (i) trademark (often written in small superscript type) - Turing machine
- TM! - (n) Tenchi Muyo!
- TMA - (i) Terminal Manoeuvring Area Restricted flying zone
- TMJ - (i) Temporomandibular Joint (syndrome)
- TMR - (i) Twin Main Rotors (helicopter type)
- TMTOWTDI - (i) There's More Than One Way To Do It (from Perl)
- TNT - (i) Trinitro toluene
- TOS - (a) Terms of Service - Tape Operating System - Tramiel Operating System
- TOW - (a) Tube-launched, Optically tracked, Wire-guided (anti-tank missile)
- TPTB - (i) The Powers That Be (often used to refer to the people responsible for the content of TV series or movies)
- TSN - (i) The Sports Network - The Sporting News
- TSR - (i) many, including Terminate and Stay Resident; see entry
- TTFN - (i) Ta Ta For Now
- TTL - (i) Transistor-transistor logic - Time 'till live - Time to live.
- TTYL - (i) Internet slang, "talk to you later"
- TU - (i) Technische Universität (German for Technical University); Thammasat University (Thailand)
- TUC - (i) Trades Union Congress
- TUG - (a) TeX Users Group
- TUI - (a/i) text user interface (cf. CLI)
- TUNS - (i) Technical University of Nova Scotia
- TVA - (i) Tennessee Valley Authority (part of New Deal)
- TWAT - (i) The War Against Terror
U
- UAB - (i) University of Alabama at Birmingham
- UAR - (i) uniformly at random (probability)
- UBC - (i) United Baptist Church - University of British Columbia
- UBS - (i) United Banque Suisse, United Bank of Switzerland
- UCBSA - (i) United Cricket Board of South Africa
- UCLA - (i) University of California, Los Angeles
- UEFA - (a) Union of European Football Associations
- UFO - (i) Unidentified Flying Object, United Farmers of Ontario
- UHF - (i) ultra high frequency
- UHMW - (i) ultra-high molecular weight
- UÇK - (i) acronym for two Albanian guerilla movements
- UID - (i) User ID.
- UK - (i) United Kingdom
- UL - (i) Underwriters Laboratories
- UN - (i) United Nations
- UNABOM - (p) University and airline bomber
- UNCF - (i) United Negro College Fund
- UNESCO - (a) United Nations Educational, Scientific and Cultural Organization
- UNHCR - (i) United Nations High Commission(er) for Refugees
- UNICEF - (a) United Nations Children's Fund, originally United Nations International Children's Emergency Fund
- UNIDO - (a) United Nations Industrial Development Organization
- UNIFEM - (p) United Nations Development Fund for Women
- UNLV - (i) University of Nevada, Las Vegas
- UNMOVIC - (p) United Nations Monitoring, Verification and Inspection Commission
- UNPROFOR - (a) United Nations Protection Force
- UNSM - (i) Union of Nova Scotian Municipalities
- UOG - (a/i) University of Guelph
- UPC - (i) Universal Product Code
- UPI - (i) United Press International
- UPN - (i) United Paramount Network.
- UPS - (i) United Parcel Service - uninterruptible power supply
- UPU - (i) Universal Postal Union
- URI - (i) uniform resource identifier
- URL - (a/i) Uniform Resource Locator (pronounced earl, or yoo-ar-ell)
- US - United States
- USA - (i) United States of America - United States Army
- USAF - (i) United States Air Force
- USAPATRIOT - (i) Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism
- USB - (a/i) Universal Serial Bus
- USC - (i) United States Code / University of Southern California / University of South Carolina
- USCG - (i) United States Coast Guard
- USDOE - (i) United States Department of Energy
- USFL - (i) United States Football League
- USGS - (i) United States Geological Survey
- USMC - (i) United States Marine Corps
- USN - (i) United States Navy
- USNY - (a) University of the State of New York (usually pronounced "USE-knee")
- USPS - (i) United States Postal Service
- USS - (i) United States ship - sometimes meaningless (see Star Trek)
- USSR - (i) Union of Soviet Socialist Republics (ie. Soviet Union)
- UU - (i) Unitarian Universalism, University of Utah, Unseen University
- UUA - (i) Unitarian Universalist Association.
- UUID - Universally Unique Identifier (see also GUID).
- UV - (i) ultraviolet
V
- VAT - (i) value-added tax
- VB - (i) Victoria Bitter - Visual Basic
- VC - (i) Victoria Cross
- VfD - (i) Votes for deletion, used in Wikipedia
- VFW - (i) Veterans of Foreign Wars
- VHF - (i) very high frequency
- VIP - (i) very important person
- VISCII - VIetnamese Standard Code for Information Interchange
- VLSI - (i) Very-large-scale integration
- VNS - (i) vagus nerve stimulation
- VOC - (i) Volatile organic compounds
- VP - (a/i) vice-president
- VSO - (i) Voluntary Services Overseas
- VTOL - (i) Vertical Takeoff & Landing
- VV - (i) Via Voice - Village Voice
W
- W3C - (i) World Wide Web Consortium
- WACC - (a) Weighted Average Cost of Capital
- WAN - (a) Wide Area Network
- WASP - (a) white anglo-saxon protestant
- WB - (i) Warner Brothers
- WC - (i) Winston Churchill - water closet - World Cup (sports)
- WCL - (i) World Confederation of Labour
- WDC - (i) World Data Center - Western Design Center
- WFP - (i) World Food Program
- WHO - (a) World Health Organisation
- WIPO - (i) World Intellectual Property Organization
- WMO - (i) World Meteorological Organization
- WNW - (i) west northwest
- WOLOG - (i) without loss of generality
- WRT - (i) with respect to
- WSJ - (i) Wall Street Journal
- WSW - (i) west southwest
- WTC - (i) World Trade Center
- WTF - (i) What the Fuck? ("WTF" could also be considered, especially in online communications, a euphemism)
- WTO - (i) World Trade Organization
- WW - (i) many, see entry
- WWE - (i) World Wrestling Entertainment
- WWI - (i) World War One (also: WW1)
- WWII - (i) World War Two (also: WW2)
- WWF - (i) World Wildlife Fund; World Wrestling Federation
- WWW - (i) World Wide Web
- WYSIWYG - (a) What You See Is What You Get (see entry for derived acronyms)
X
- XHTML - (i) eXtensible Hypertext Markup Language
- XML - (i) eXtensible Markup Language
- XrML - (i) eXtensible Rights Markup Language
- XSL - (i) eXtensible Style Language
Y
- YAC - (a/i) Youth-Adult Committee.
- YAP - (a) Young Aspiring Professional
- Yippie - (a) Youth International Party + suffix
- YM - (i) Your Magazine (originally Young Miss, later Young & Modern)
- YMCA - (i) Young Men's Christian Association
- YMMV - (i) Your Mileage May Vary
- YRUU - (i) Young Religious Unitarian Universalists.
- Yuppie - (a) Young Urban Professional + suffix
- YWCA - (i) Young Women's Christian Association
Z
- ZCU - (i) Zimbabwe Cricket Union
- ZIP code - (a) Zoning Improvement Plan
- ZOPFAN - (i) Zone of Peace, Freedom and Neutrality
Dubious entries
Words that may not be acronyms, but (humorous) folk etymology says that they are, some of these are backronyms:
- Fuck - (a) Fornication under consent of the king - For unlawful carnal knowledge
- Golf - (a) Gentlemen only, ladies forbidden
- News - (a) North, east, west and south (a mnemonic)
- Pom - (a) (Australian English) Prisoner of His Majesty
- Posh - (a) Port out, starboard home
- Rap - (a) Rhythm and poetry - Rhythmical African poetry - Rhythmic American Poetry
- Tip - (a) To insure promptness - (plural) To insure prompt service
See also
- Backronym
- List of portmanteaus
- List of U.S. Army acronyms and expressions
- List of government and military acronyms