OS
OS, O.S., Os, O's, or os may refer to: == Computing == Operating system, collection of software that manages computer hardware and software resources Open source (disambiguation) OpenStack, a software platform for cloud computing == Medicine == os or ostium, a mouth or mouth-like opening per os, meaning "ingestion by mouth" external os, the external orifice of the uterus internal os, the internal orifice of the uterus os or ostium, the opening of a coronary artery O.S. or OS, oculus sinister, meaning "left eye" in general ophthalmologic or optometric usage, particularly in eyeglass prescriptions (deprecated abbreviation) Ohtahara syndrome, a brain disorder Overall survival rate, a cancer survival statistic Oneiroid syndrome, a dreamlike fantastic delusional state == People == Alexander Os (born 1980), a Norwegian biathlete Os du Randt (born 1972), a South African rugby player Os Guinness (born 1941), an English author and social critic For people named van Os see Van Os == Places == === Norway === Os Municipality (Innlandet), a municipality in Innlandet county, Norway Os Municipality (Hordaland), a former municipality in the old Hordaland county, Norway Os i Østerdalen, a village within Os Municipality in Innlandet county, Norway Os, Østfold, a parish in Rakkestad Municipality in Østfold county, Norway Os Church, a name for several churches in Norway === Poland === Oś, Kluczbork County, a village in Kluczbork County, Opole Voivodeship, Poland Osiedle (Os.), a Polish term used for housing subdivisions in Poland === Other places === Os, Värnamo, a village in Värnamo Municipality, Småland province, Sweden OS, ICAO code for airports in Syria OS, WMO country code for Austria == Geography and transportation == Esker, also os, a long, winding ridge of sand and gravel in (formerly) glaciated regions Ordnance Survey, national mapping agency of Great Britain Austrian Airlines (IATA code OS based on its original name: Österreichische Luftverkehrs AG) O.S. Engines, a Japanese manufacturer of model aircraft engines == Sport == Ohio State Buckeyes, a group of collegiate teams representing The Ohio State University Os TF, a sports club in Os, Norway On-sight climbing, an ascent of a rock climbing route on the first attempt Orioles, nicknamed "O's": Baltimore Orioles, a Maryland baseball team Charlotte Orioles, a North Carolina baseball team, renamed the Charlotte Knights in 1988 Leyton Orient F.C., an English football (soccer) team nicknamed "O's" London Olympians, named 1995–2005 as London O's, an American football team based in Greenwich, London, England == Titles == Ordinary seaman, an unlicensed member of the deck department of a merchant ship Ordnance sergeant, an enlisted rank in the U.S. and Confederate armies during the American Civil War era Old Shirburnian, used by alumni of Sherborne School Old Stonyhurst, used by alumni of Stonyhurst College O.S., Order of Santiago, a Spanish order dedicated to St James the Greater O.S., Order of Sikatuna, the national order of diplomatic merit of the Philippines == Language == Ōs (rune) (ᚩ), a rune of the Anglo-Saxon fuþorc Ossetic language (ISO 639-1 abbreviation OS) == Food == "O's", a name for breakfast cereal with O-shaped pieces, cereal similar to , e.g.