Na

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NA, N.A., Na, nA or n/a may refer to:

Chemistry and physics

Sodium, symbol Na, a chemical element
Avogadro constant (N_A)
Nucleophilic addition, a type of reaction in organic chemistry
Numerical aperture, a number that characterizes a range of angles in an optical system
nA, the symbol for nanoampere
Naturally aspirated engine

Biology and medicine

Na (tree) or Mesua ferrea, a species of tree native to Sri Lanka
Neuroacanthocytosis, a neurological condition
Nomina Anatomica, a former international standard for human anatomical nomenclature
Noradrenaline, a hormone
Nucleic acid analogue, compounds analogous to naturally occurring RNA and DNA

Places

Current

Namibia (ISO country code)
Naples (car number plate code: NA), Italy
North America, a continent
North Africa, a subcontinent

Historical

Netherlands Antilles (former international vehicle registration code: NA)
Na (Chinese state), a small state of the Chinese Zhou dynasty from the 11th to 8th centuries BC
Nakoku, or Na, a state in Kyūshū, Japan from the 1st to early 3rd centuries AD

Names and titles

Na (羅), a Korean surname related to the Chinese surname Luo
Na, a particle used in Thai noble names
National Academician, a member of the National Academy of Design

Art and entertainment

Na (drum), a drum played by Tibetan shamans
Nahal, Shine's pet Bengal tiger on the Nick Jr. TV show Shimmer and Shine
New adult fiction, fiction marketed to people 18–30 years old
Virgin New Adventures, a series of Doctor Who novels
Na (EP) by Nayeon, 2024

Transport

NA, the tailcode of VFA-94
Nepal Airlines, the national flag carrier airline of Nepal
North American Airlines (IATA code: NA)
Naturally aspirated engine
NA MX-5 Miata, the first generation of the Mazda Miata

Language

Na (cuneiform), a cuneiform sign
Na (Javanese) (ꦤ), a letter in the Javanese script
Na (kana), a Japanese kana
Na dialect, a Sino-Tibetan variety of India
Na language (Narua), a Sino-Tibetan language of Yunnan, China
Nauruan language (ISO code: na)

Organizations

Narcotics Anonymous (NA), a twelve-step program that focuses on recovery from drug addiction
National Alliance (Latvia), a Latvian political party
National Alliance (Netherlands), a former Dutch political party
National Association (disambiguation)
National Association of Professional Base Ball Players, the first professional baseball league
Nepali Army, the land military force of Nepal
Neurotics Anonymous (N/A), a program for recovery from mental and emotional illness

Other uses

.na, the top-level domain for Namibia
N/A, meaning not applicable, not available, or no answer
N.A., the official designation of federally chartered banks in the United States
Mosuo or Na, an ethnic group in China near Tibet
Na people, an ethnic group in India
National Archives, the archives of a country