O2 — Mediated Wiki

{{wiktionary|O₂}} '''O2''', '''O-2''', '''o2''', or similar orthography may refer to:

{{TOC right}} ==Science and technology==  * Dioxygen ({{chem2|O2}}), the common allotrope of oxygen * Oxide ({{chem2|O(2-)}}), an ion * Superoxide ({{chem2|O2-}}), an ion * Dioxygenyl ({{chem2|O2+}}), an ion * Doubly ionized oxygen ({{chem2|O(2+)}}), 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

==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 * ''O2'' (2024 film), an Indian Kannada language medical thriller film

===Music=== ====Albums==== * ''O<sub>2</sub>'' (FireHouse album) (2000) album of the rock band FireHouse * ''O2'' (O-Town album) (2002) album by American boy band O-Town * O<sub>2</sub> (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'' * UOC O2, institutional repository of the Open University of Catalonia

==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 * ''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 * GNR Class O2, a class of British steam locomotives classified O2 by both the GNR and the LNER

===Pay grade=== * O-2, a uniformed services pay grade of the United States: ** 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

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