O2

O2, O-2, o2, O2, O2, O2− or O2+ may refer to:
Science and technology
or dioxygen, the common allotrope of the chemical element oxygen
, the ion oxide
, the ion superoxide
, the ion dioxygenyl
, 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
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
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
Arts, entertainment, and media
Film
Oxygen (2021 film) or O2, an American-French survival thriller film in production
O2 (2020 film), an Estonian-Latvia-Lithuanian-Finnish historical spy thriller film
O2 (2022 film), an Indian Tamil language survival thriller film
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
"O2", a song by Suho from Self-Portrait
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 (brand), Telefónica mobile network global brand name
O2 (Ireland), merged into Three Ireland
O2 (UK)
O2 Czech Republic
Telefónica Germany
Telefónica 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 socially political TV channel
Vehicles and vessels
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
Orbital O2, a tidal power turbine in Orkney
GNR Class O2, a class of British steam locomotives classified O2 by both the GNR and the LNER
Other uses
O-2, a pay grade in the US uniformed services
First lieutenant (United States) in the Army, Marine Corps, Air Force, and Space Force
Lieutenant (junior grade) in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps
See also
02 (disambiguation)
Oz (disambiguation)
2O (disambiguation)
2Q (disambiguation)
Q2 (disambiguation)