# O2 > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/O2 > Markdown URL: https://mediated.wiki/source/O2.md > Source: https://en.wikipedia.org/wiki/O2 > Source revision: 1339029831 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) **O2**, **O-2**, **o2**, or similar orthography may refer to: ## Science and technology - [Dioxygen](/source/Dioxygen) (O2), the common allotrope of oxygen - [Oxide](/source/Oxide) (O(2-)), an ion - [Superoxide](/source/Superoxide) (O2-), an ion - [Dioxygenyl](/source/Dioxygenyl) (O2+), an ion - [Doubly ionized oxygen](/source/Doubly_ionized_oxygen) (O(2+)), an ion - [O(2)](/source/O(2)), the 2-dimensional orthogonal group in group theory - O2, an EEG electrode site according to the [10–20 system](/source/10%E2%80%9320_system_(EEG)) - [SGI O2](/source/SGI_O2), a Unix workstation computer - O2, a class of [O-type star](/source/O-type_star) - [Orbital O2](/source/Orbital_O2), a tidal power turbine in Orkney, Scotland - -O2, a [compiler optimization](/source/Optimizing_compiler) tag ## Places - [The O2](/source/The_O2), an entertainment district in London, England - [The O2 Arena](/source/The_O2_Arena), the arena within The O2 - [O2 Arena (Prague)](/source/O2_Arena_(Prague)) or Sazka Arena, an arena in Prague, Czech Republic - [O2 Centre](/source/O2_Centre), an indoor shopping and entertainment centre on Finchley Road, London, England - [O2 Residence](/source/O2_Residence), a part of the Jumeirah Lake Towers in Dubai, United Arab Emirates - [O2 World (Berlin)](/source/O2_World_(Berlin)), former branding for Uber Arena, an indoor arena in Berlin, Germany - [O2 World (Hamburg)](/source/O2_World_(Hamburg)), former branding for Barclays Arena, an indoor arena in Hamburg, Germany - [Otoyol 2](/source/Otoyol_2), a motorway in Turkey called "O2" - [The O2 (Dublin)](/source/The_O2_(Dublin)), the former name of 3Arena - [Ring 2 (Aarhus)](/source/Ring_2_(Aarhus)), a road in Aarhus, Denmark, which appears as "O2" on signs - [Ring 2 (Copenhagen)](/source/Ring_2_(Copenhagen)), a road in Copenhagen, Denmark, which appears as "O2" on signs ## Arts, entertainment and media ### Film - [*Oxygen* (2021 film)](/source/Oxygen_(2021_film)) or *O2*, an American-French survival thriller film in production - [*O2* (2020 film)](/source/O2_(2020_film)), an Estonian-Latvia-Lithuanian-Finnish historical spy thriller film - [*O2* (2022 film)](/source/O2_(2022_film)), an Indian Tamil language survival thriller film - [*O2* (2024 film)](/source/O2_(2024_film)), an Indian Kannada language medical thriller film ### Music #### Albums - [*O2* (FireHouse album)](/source/O2_(FireHouse_album)) (2000) album of the rock band FireHouse - [*O2* (O-Town album)](/source/O2_(O-Town_album)) (2002) album by American boy band O-Town - [O2 (Tonéx album)](/source/O2_(Ton%C3%A9x_album)) (2002) album by Gospel singer Tonéx - *[O2: Avalon Remixed](/source/O2:_Avalon_Remixed)*, a 2002 album by Avalon - [*O2* (Son of Dave album)](/source/O2_(Son_of_Dave_album)), 2006 album by Son of Dave #### Songs - "O2", a song by Orange Range from *[Panic Fancy](/source/Panic_Fancy)* - "O2", a 2002 song by Sleater-Kinney from *[One Beat](/source/One_Beat)* - "O2", a song by Suho from *[Self-Portrait](/source/Self-Portrait_(EP))* ### Other arts, entertainment and media - [Ö2](/source/%C3%962), a radio service for Austria and South Tyrol - O2, a character in *[Kirby 64: The Crystal Shards](/source/Kirby_64:_The_Crystal_Shards)* - [UOC O2](/source/UOC_O2), institutional repository of the Open University of Catalonia ## Businesses and organisations - [O2 (brand)](/source/O2_(brand)), a global brand name owned by the Spanish telecommunications company Telefónica - [O2 Store](/source/O2_Store), a chain of retail stores owned and operated by Telefónica Europe, with regional subsidiaries: - [O2 (Ireland)](/source/O2_(Ireland)), merged into Three Ireland - [O2 (UK)](/source/O2_(UK)), a joint venture with Liberty Global - [O2 Czech Republic](/source/O2_Czech_Republic) - [Telefónica Germany](/source/Telef%C3%B3nica_Germany) - [O2 Slovakia](/source/O2_Slovakia) - [O2 Academy](/source/O2_Academy), a chain of music venues - [O2 Wireless USA](/source/O2_Wireless_USA) or H2O Wireless, a prepaid wireless service by Locus Telecommunications - [O2TV](/source/O2TV), a Russian independent TV channel ## Vehicles and military - [Cessna O-2 Skymaster](/source/Cessna_O-2_Skymaster), a military twin-engine light aircraft - [Douglas O-2](/source/Douglas_O-2), a military single-engine observation biplane - [*O 2*-class submarine](/source/O_2-class_submarine), a class of submarines of the Royal Netherlands Navy - [Oldershaw O-2](/source/Oldershaw_O-2), a glider - [SP&S Class O-2](/source/SP%26S_Class_O-2), a 1910 steam locomotives class - [USS *O-2* (SS-63)](/source/USS_O-2_(SS-63)), a 1918 United States O class submarine - [GNR Class O2](/source/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](/source/Uniformed_services_pay_grades_of_the_United_States): - [First lieutenant (United States)](/source/First_lieutenant_(United_States)) in the Army, Marine Corps, Air Force, and Space Force - [Lieutenant (junior grade)](/source/Lieutenant_(junior_grade)) in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps ## See also - [02 (disambiguation)](/source/02_(disambiguation)) - [Oz (disambiguation)](/source/Oz_(disambiguation)) - [2O (disambiguation)](/source/2O_(disambiguation)) - [2Q (disambiguation)](/source/2Q_(disambiguation)) - [Q2 (disambiguation)](/source/Q2_(disambiguation)) --- Adapted from the Wikipedia article [O2](https://en.wikipedia.org/wiki/O2) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/O2?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.