O2

O2, O-2 or O₂ may refer to:

• The year 2002

in science:

• Oxygen (O₂, in its molecular form)
• O2 star, a subclass of O-class stars
• Y-DNA Haplogroup O2

in videogames:

• Magnavox Odyssey², a games console
• O2Jam, a Korean electronic rhythm game
• The O2 line of extreme sports video games by Activision

in music:

• O2, the 2002 album from the band O-Town
• “O2,” a song on the 2002 Sleater-Kinney album One Beat
• O₂, an album by the rock band FireHouse

Places:

• The O₂, the official name of the Millennium Dome in London
• O2 Centre, an indoor shopping and leisure centre on Finchley Road, London
• O₂ World, indoor arena currently under construction in Berlin
• Oyotol 2, a Turkish highway around Istanbul

Organizsations:

• Telefónica O₂, a telecommunications company.
• O2 Global Network, an international network for sustainable design
• The 02 Raffles Institution Scout Group, the oldest unit of The Singapore Scout Association

in other fields:

• Douglas O-2, a military single-engine observation biplane
• O-2 Skymaster, a military twin-engine light aircraft
• SGI O2, a workstation computer
• Oceanic Airlines (Guinea) IATA airline designator
• Riverstone O2, a Wine aerating Glass
• O2 Optix, a brand of breathable contact lenses