# OS

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> Markdown URL: https://mediated.wiki/source/OS.md
> Source: https://en.wikipedia.org/wiki/OS
> Source revision: 1344072823
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{wiktionary|OS|Os|os}}
'''OS''', '''O.S.''', '''Os''', '''O's''', or '''os''' may refer to:

== Computing ==
* [Operating system](/source/Operating_system), system software that manages computer hardware and software resources
* [Open source (disambiguation)](/source/Open_source_(disambiguation))
* [OpenStack](/source/OpenStack), a software platform for cloud computing

== Medicine ==
* os or ostium, a [mouth](/source/mouth) or mouth-like opening
** ''external os'', the [external orifice of the uterus](/source/external_orifice_of_the_uterus)
** ''internal os'', the [internal orifice of the uterus](/source/internal_orifice_of_the_uterus)
** ''[per os](/source/per_os)'', meaning "ingestion by mouth"
** ''os'' or ''ostium'', the opening of a [coronary artery](/source/Coronary_circulation)
* ''O.S.'' or ''OS'', ''oculus sinister'', meaning "left eye" in general ophthalmologic or optometric usage, particularly  in [eyeglass prescriptions](/source/Eyeglass_prescription) (deprecated abbreviation)
* [Ohtahara syndrome](/source/Ohtahara_syndrome), a brain disorder
* [Overall survival rate](/source/Overall_survival_rate), a cancer survival statistic
* [Oneiroid syndrome](/source/Oneiroid_syndrome), a dreamlike fantastic delusional state

== People ==
* [Alexander Os](/source/Alexander_Os) (born 1980), a Norwegian biathlete
* [Os du Randt](/source/Os_du_Randt) (born 1972), a South African rugby player
* [Os Guinness](/source/Os_Guinness) (born 1941), an English author and social critic
* For people named ''van Os'' see [Van Os](/source/Van_Os)

== Places ==
=== Norway ===
* [Os Municipality (Innlandet)](/source/Os_Municipality_(Innlandet)), a municipality in Innlandet county, Norway
* [Os Municipality (Hordaland)](/source/Os_Municipality_(Hordaland)), a former municipality in the old Hordaland county, Norway
* [Os i Østerdalen](/source/Os_i_%C3%98sterdalen), a village within Os Municipality in Innlandet county, Norway
* [Os, Østfold](/source/Os%2C_%C3%98stfold), a parish in Rakkestad Municipality in Østfold county, Norway
* [Os Church](/source/Os_Church_(disambiguation)), a name for several churches in Norway

=== Poland ===
* [Oś, Kluczbork County](/source/O%C5%9B%2C_Kluczbork_County), a village in Kluczbork County, Opole Voivodeship, Poland
* [Osiedle](/source/Osiedle) (Os.), a Polish term used for housing subdivisions in Poland

=== Other places ===
* [Os, Värnamo](/source/Os%2C_V%C3%A4rnamo), a village in Värnamo Municipality, Småland province, Sweden
* OS, [ICAO code](/source/List_of_airports_by_ICAO_code%3A_O) for airports in Syria
* OS, WMO country code for [Austria](/source/Austria)

== Religion ==
* [Ōs](/source/%C5%8Cs), an Old English word denoting a god in Anglo-Saxon paganism, related to ''æsir''
* O.S., [Order of Santiago](/source/Order_of_Santiago), a Spanish order dedicated to St James the Greater
* O.S., [Order of Sikatuna](/source/Order_of_Sikatuna), the national order of diplomatic merit of the Philippines

== Science ==
* [''Ocean Science'' (journal)](/source/Ocean_Science_(journal)), an oceanographic journal
* [Osmium](/source/Osmium), symbol Os, a chemical element

== Businesses ==
* [Ordnance Survey](/source/Ordnance_Survey), national mapping agency of Great Britain
* [Austrian Airlines](/source/Austrian_Airlines) (IATA code OS based on its original name: ''Österreichische Luftverkehrs AG'')
* [O.S. Engines](/source/O.S._Engines), a Japanese manufacturer of model aircraft engines

== Sport ==
* [Ohio State Buckeyes](/source/Ohio_State_Buckeyes), a group of collegiate teams representing The Ohio State University
* [Os TF](/source/Os_TF), a sports club in Os, Norway
* [On-sight climbing](/source/On-sight_climbing), an ascent of a rock climbing route on the first attempt
* [Baltimore Orioles](/source/Baltimore_Orioles), an American baseball team nicknamed "O's"
* [Leyton Orient](/source/Leyton_Orient), an English football (soccer) team nicknamed "O's"

== Titles ==
* [Ordinary seaman](/source/Ordinary_seaman), an unlicensed member of the deck department of a merchant ship
* [Ordnance sergeant](/source/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](/source/List_of_Old_Shirburnians)
* Old Stonyhurst, used by [alumni of Stonyhurst College](/source/List_of_Old_Stonyhursts)

== Other uses ==
* [Esker](/source/Esker), also os, a long, winding ridge of sand and gravel in (formerly) glaciated regions
* ["Os" (''Fringe'')](/source/Os_(Fringe)), an episode of the television show ''Fringe''
* [Ōs (rune)](/source/%C5%8Cs_(rune)) (ᚩ), a rune of the Anglo-Saxon fuþorc
* [Old Style](/source/Old_Style_and_New_Style_dates) (O.S.) date, indicating use of an earlier calendar (in Anglophone countries, the Julian Calendar), as opposed to "N.S." (new style), usually indicating use of the Gregorian Calendar
* [Ossetic language](/source/Ossetic_language) (ISO 639-1 abbreviation OS)

== See also ==
* [0S (disambiguation)](/source/0S_(disambiguation))
* [ÖS (disambiguation)](/source/%C3%96S_(disambiguation))
* [Oz (disambiguation)](/source/Oz_(disambiguation))

{{disambiguation|geo}}

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Adapted from the Wikipedia article [OS](https://en.wikipedia.org/wiki/OS) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/OS?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.