O2

Look up O₂ in Wiktionary, the free dictionary.

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

Science and technology

• Dioxygen (O₂), the common allotrope of oxygen
• Oxide (O²⁻), an ion
• Superoxide (O−2), an ion
• Dioxygenyl (O+2), an ion
• Doubly ionized oxygen (O²⁺), an ion
• O(2), the 2-dimensional orthogonal group in group theory
• O2, an EEG electrode site according to the 10–20 system
• SGI O2, a Unix workstation computer
• O2, a class of O-type star
• Orbital O2, a tidal power turbine in Orkney, Scotland
• -O2, a compiler optimization tag

Places

• The O2, an entertainment district in London, England
  • The O2 Arena, the arena within The O2
• O2 Arena (Prague) or Sazka Arena, an arena in Prague, Czech Republic
• O2 Centre, an indoor shopping and entertainment centre on Finchley Road, London, England
• O2 Residence, a part of the Jumeirah Lake Towers in Dubai, United Arab Emirates
• O2 World (Berlin), former branding for Uber Arena, an indoor arena in Berlin, Germany
• O2 World (Hamburg), former branding for Barclays Arena, an indoor arena in Hamburg, Germany
• Otoyol 2, a motorway in Turkey called "O2"
• The O2 (Dublin), the former name of 3Arena
• Ring 2 (Aarhus), a road in Aarhus, Denmark, which appears as "O2" on signs
• Ring 2 (Copenhagen), a road in Copenhagen, Denmark, which appears as "O2" on signs
• The O2 Belfast, an entertainment, education, and leisure destination in Belfast, Northern Ireland

Arts, entertainment and media

Businesses and organisations

• O2 (brand), a global brand name owned by the Spanish telecommunications company Telefónica
  • O2 Store, a chain of retail stores owned and operated by Telefónica Europe, with regional subsidiaries:
  • O2 (Ireland), merged into Three Ireland
  • O2 (UK), a joint venture with Liberty Global
  • O2 Czech Republic
  • Telefónica Germany
  • O2 Slovakia
• O2 Academy, a chain of music venues
• O2 Wireless USA or H2O Wireless, a prepaid wireless service by Locus Telecommunications
• O2TV, a Russian independent TV channel

Vehicles and military

• Cessna O-2 Skymaster, a military twin-engine light aircraft
• Douglas O-2, a military single-engine observation biplane
• GNR Class O2, a class of British steam locomotives classified O2 by both the GNR and the LNER
• LSWR O2 class, a class of British steam locomotives
• O 2-class submarine, a class of submarines of the Royal Netherlands Navy
• Oldershaw O-2, a glider
• SP&S Class O-2, a 1910 steam locomotives class
• Taff Vale Railway O2 class, a class of British steam locomotives
• USS O-2 (SS-63), a 1918 United States O class submarine

See also

• 02 (disambiguation)
• Oz (disambiguation)
• 2O (disambiguation)
• 2Q (disambiguation)
• Q2 (disambiguation)

Topics referred to by the same term

This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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