O2

O2, O-2, o2, O₂, or O² may refer to:

Science and technology

For vehicles, see § Vehicles.

• O₂, the common allotrope of the chemical element 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

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), an indoor arena in Berlin, Germany
• O2 World (Hamburg), an indoor arena in Hamburg, Germany
• Otoyol 2, a motorway in Turkey called "O2"
• The O2 (Dublin), the former name of 3Arena

Arts, entertainment, and media

Music

Albums

• O₂ (FireHouse album) (2000) album of the rock band FireHouse
• O2 (O-Town album) (2002) album by American boy band O-Town
• O₂ (Tonéx album) (2002) album by Gospel singer Tonéx
• O2: Avalon Remixed, a 2002 album by Avalon
• O2 (Son of Dave album), 2006 album by Son of Dave

Songs

• "O2", a song by Orange Range from Panic Fancy
• "O2", a 2002 song by Sleater-Kinney from One Beat

Other arts, entertainment, and media

• Ö2, a radio service for Austria and South Tyrol
• O2, a character in Kirby 64: The Crystal Shards

Businesses and organisations

• O₂, trading name for Telefónica Europe, a European telecommunications provider
  • O2 Store, a chain of retail stores owned and operated by Telefónica Europe, with regional subsidiaries:
  • O2 (Ireland), merged into Three Ireland
  • O2 (UK)
  • O2 Czech Republic
  • Telefónica Germany
  • Telefónica Slovakia
• O2 Academy, a chain of music venues
• O2 Global Network, an international network for sustainable design
• O2 Wireless USA or H2O Wireless, a prepaid wireless service by Locus Telecommunications
• O2TV, a Russian independent socially political TV channel

Vehicles

• Cessna O-2 Skymaster, a military twin-engine light aircraft
• Douglas O-2, a military single-engine observation biplane
• 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
• USS O-2 (SS-63), a 1918 United States O class submarine

Other uses

• O-2, a pay grade in the US uniformed services
  • First Lieutenant in the Army, Air Force, and Marine Corps
  • Lieutenant (junior grade) in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps