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

★ O2, the second album from gospel artist Tonex released in 2002
'Places':

★ The O₂, a large entertainment district in London including a 23, 000 seat indoor arena, developed within the former Millennium Dome.

★ 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
'Organizations':

★ 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

★ 02, the area code for Brussels in the Belgian telephone numbering plan