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

Science and technology

  • O2 or dioxygen, the common allotrope of the chemical element oxygen
  • O2−, the ion oxide
  • O2, the ion superoxide
  • O+2, the ion dioxygenyl
  • O2+, doubly ionized oxygen
  • O2, an EEG electrode site according to the 10–20 system
  • SGI O2, a Unix workstation computer
  • UOC O2, institutional repository of the Open University of Catalonia
  • O2, the earliest defined spectral class for stars

Places

Arts, entertainment, and media

Film

Music

Albums

Songs

Other arts, entertainment, and media

Businesses and organisations

Vehicles and vessels

Other uses

See also

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