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O2, O-2, o2, O2, or O2 may refer to:

Science and technology[edit]

  • Oxygen, by molecular formula (O2)
  • SGI O2, a Unix workstation computer
  • UOC O2, UOC's institutional repository
  • O2: an EEG electrode site according to the 10-20 system.




  • O2 Centre, an indoor shopping and entertainment centre on Finchley Road, London
  • O2 Arena (Prague), the renamed Sazka Arena in Prague, Czech Republic
  • The O2, a large entertainment district in London developed within the former Millennium Dome
  • O2 Residence, a 41-floor tower part of the Jumeirah Lake Towers in Dubai, United Arab Emirates
  • O2 Store, a chain of retail stores owned and operated by Telefónica Europe
  • O2 World (Berlin), indoor arena in Berlin, Germany
  • O2 World (Hamburg), indoor arena in Hamburg, Germany
  • O2 Academy, a chain of music venues


Other uses[edit]

See also[edit]