(Main list of acronyms)
__NOTOC__ O – (i) Oberst – Observer – Obstacle – Octal – Officer – Official – Oh – Operational – Operator – Oprah (magazine) – Outstanding – (s) Oxygen
OA OA – (i) Operational Analysis – (i) Overeaters Anonymous OAC – (i) On Approved Credit OAP – Old Age Pensioner (UK) OAS – (i) Organization of American States OARSI – (i) Osteoarthritis Research Society International OASIS – (a) Objects and Agents for Information Systems and Simulation – Organization for the Advancement of Structured Information Standards OASIS – (a) Ontario Agencies Supporting Individuals with Special Needs OASIS – (a) Ontario Association of Sewage Industry Services OASP – (i) Operational Analysis Support Paper/Plan OAU – (i) Organization of African Unity
OB ob – (p) obiit (Latin, "(s) he died") OB (p) Obedience Obligation Obligatory Obsolete Obstetrics (i) Ocean Beach (California) Off Break (cricket) Old Bryanstonian Order of Battle Out-of-Bounds (golf) Outlet Box (electrical) (p) Overbought (stock market) (i) Oversight Board OBE – (i) Officer of the Order of the British Empire OBJ (p) Objective (military parlance) (i) Odell Beckham Jr. (American football wide receiver) OBM – (p) Obsidian Black Metallic (automobile paint color) OBOR – (i) One Belt One Road, a former name of the China-sponsored Belt and Road Initiative OBS (p) Observation/Observer Obsolete Obstacle (i) Off Balance Sheet Optical Burst Switching (IEEE) Organic Brain Syndrome Organization(al) Breakdown Structure OBSS (i) Off Board Sensor Systems Ordo Byantinus Sancti Sepulchri (Byzantine Order of the Holy Sepulchre) Orbiter Boom Sensor System (space shuttle) Origins Billion Star Survey OBX – (p) Outer Banks (North Carolina)
OC oc – (s) Occitan language (ISO 639-1 code) OC – (i) Officer Commanding OCA – (i) Observatoire de la Côte d'Azur – Offensive Counter-Air OCD – (i) Obsessive-Compulsive Disorder OCFS – (i) Oracle Cluster File System OCFS – (i) Office of Children & Family Services OCFS2 – (i) Oracle Cluster File System Release 2 oci – (s) Occitan language (ISO 639-2 code) OCIDS – (i) Optical Combat Identification System OCMCC – (i) Orchard County MCC OCONUS - Outside Continental United States OCN – (i) Oncology Certified Nurse OCO – (i) Oort Cloud Object OCOKA – (a) Observation, Cover and concealment, Obstacles, Key terrain, and Avenues of approach (mnemonic) OCR – (i) Optical Character Recognition OCS – see entry
OD OD (i) Old Dragon Ordnance Datum (nautical charts) (p) Overdose ODAS – (a) OCA-DLR Asteroid Survey ODB (i) Ol' Dirty Bastard (rapper) (i) One Dirty B*tch/Broad/Babe (professional wrestler) (i) Operational Data Base (i) Original David Baker (professional poker player; used to distinguish from another professional poker player of the same name) (i) Oxford Dictionary of Byzantium ODBC – (i) Open DataBase Connectivity ODI (i) Office for Disability Issues (UK government agency) One Day International (cricket) Open Data-Link Interface Oracle Data Integrator
OE OEA – (i) (U.S.) Office of Economic Adjustment OED – (i) Oxford English Dictionary OECD – (i) Organisation for Economic Co-operation and Development (international) OEG – (i) Operation Exposure Guidance OEIS - (i) On-Line Encyclopedia of Integer Sequences OEM – (i) Original equipment manufacturer
OF OFA – (i) Occipital Face Area OFDA – (i) U.S. Agency for International Development's Office of Foreign Disaster Assistance
OG OG: Objective Glass, see Objective (optics) Obstetrics and gynaecology Offensive Guard, see Guard (American football) Old Giggleswickian, a former pupil of Giggleswick School Old Gower, a former pupil of University College School Old Gregorian, a former pupil of Downside School Old Greshamian, a former pupil of Gresham's School Old Gold, a dark yellow Olympic Games Original Gangster, see Gangster Original Gravity, see Gravity (beer) Outpost Gallifrey, a Doctor Who fansite. Own goal, in soccer, a goal scored by a player in their own side's goal OG: Optimized Gaia, theory the earth optimizes itself to promote life, and popular movement to Promote Human Progress in Harmony with the Natural World. OG: Original Gangster, an album by Ice-T OGC – (i) Open Geospatial Consortium OGD – (i) Other Government Department OGO – (i) Other Government Organization OGX – OUARGLA – a petroleum state in the south of Algeria
OH OH – (s) Ohio (postal symbol) OHC – (i) OverHead-Cam engine OHHLA – (a) Original Hip-Hop Lyrics Archive OHIP – (a) Ontario Health Insurance Plan OHMS – (i) On His (or Her Majesty's Service) (also written: O.H.M.S.) OHP – (i) Observatoire de Haute-Provence OHSS – (p) Ovarian Hyperstimulation Syndrome
OI OIC – (i) Officer In Charge OIE – (i) World Organisation for Animal Health (originally the Office international des épizooties, French for "International Epizootic Office") OIF – (i) Operation Iraqi Freedom OIOC – (i) Oriental & India Office Collections (in the British Library)
OJ oj – (s) Anishinaabe language (Ojibwa) (ISO 639-1 code) OJ – (i) Orange Juice – O. J. Simpson oji – (s) Anishinaabe language (Ojibwa) (ISO 639-2 code) OJT – On-the-Job Training
OK OK (s) Oklahoma (postal symbol) (i) oll korrect (facetious alteration of "all correct", 1839) OKC – (a) Oklahoma City
OL OLED – (a) Organic Light-Emitting Diode OLS – (i) Operational Linescan System
OM om – (s) Oromo language (ISO 639-1 code) OM – (s) Oman (ISO 3166 digram) – Olympique de Marseille (French football club) OMA – (i) Open Mobile Alliance – Operations & Maintenance, Army OMB – (i) U.S. Office of Management and Budget – Ontario Municipal Board – (i) Order of Mapungubwe in Bronze OMD – (i) Orchestral Manoeuvres in the Dark (1980s pop group) OME – (i) Osaka Mercantile Exchange OMFG – (i) Oh My F**king God OMG – (i) Oh My God or Or My Gosh OMGW – (i) "Oh My Gosh it's Windy" OMN – (s) Oman (ISO 3166 trigram) OMNCS – (i) U.S. Office of the Manager for the National Communications System OMP – (i) Order of Mapungubwe in Platinum OMR – (s) Omani rial (ISO 4217 currency code) OMS – (i) Order of Mapungubwe in Silver OMT – (i) Object Model Template OMW – (i) On My Way, Oh My Word
ON ON – (s) Ontario (postal symbol) Onna – Oniong, Nnung Ndem, and Awa, a Local Government Area in Nigeria ONC – (i) Orthopaedic Nurse Certified ONCE – (a) Organización Nacional de Ciegos Españoles (Spanish, "National Organization for the Spanish Blind") ONÉRA – (a) Office national d'études et de recherches aérospatiales (French, "Aeronautics and Space Research Center") ONG – (i) Orthodontic National Group ONH – (i) Óglaigh na hÉireann (Irish idiom for "soldiers of Ireland"), used for the following: Historically, as the Irish-language name for the original Irish Republican Army ("Old IRA") In modern times, as the Irish-language name of the Defence Forces of Ireland The name of two groups claiming descent from the Old IRA, one a currently inactive splinter group of the Continuity IRA and the other an active splinter group of the Real IRA ONI – (i) (U.S.) Office of Naval Intelligence ONS – (i) Operational Needs Statement
OO OO – (i) Object Oriented – Over & Out OOO – (i) Out Of the Office OOAD – (i) Object-Oriented Analysis and Design OOBE – (a) Out-of-body experience OOCL – (i) Orient Overseas Container Line OODA – (i) Observation, Orientation, Decision, Action loop (a.k.a. Boyd's Loop) OOMF – (i) One Of My Followers OOP – (i) Object-Oriented Programming – Out Of Print OOS – (i) Occupational Overuse Syndrome – OneSAF Objective System – Open Operating System – Out Of Service OOTW – (i) (Military) Operations Other Than War (MOOTW or OOTW)
OP OP (i) Observation Point/Post Ocean Pacific (surfwear and swimwear brand) Original Poster (internet) Order Point, in inventory management; the inventory state at which more items should be ordered. Often expressed as a part of OP/OQ (when quantity OP is reached, order OQ new items) Overpowered, often used to refer to fictional characters (e.g. Superman) or game mechanics (e.g. the Black Lotus in Magic: the Gathering) that are considered disproportionately strong OPA – (i) Other Procurement, Army OPAC – (a) Online Public Access Catalogue op cit – (p) opera citata (Latin, "in the work cited") OPCON – (p) Operational control OPCW – (i) Organisation for the Prohibition of Chemical Weapons OPEC – (a) Organization of the Petroleum Exporting Countries OpenStreetMap - (p) OpenStreetMap OPFOR – (p) Opposing force(s) OPI (i) Office of Primary Interest Open Prepress Interface OPINTEL – (p) Operational Intelligence OPLAN – (p) Operation plan (also OpPlan) OPORD – (p) Operation order OPP (i) Ontario Provincial Police Operational Planning Process Other People's Property/Pussy/Penis (song) OPS (i) On-base plus slugging (baseball statistics) (p) Operations OPSEC (p) Operations security Open Platform for Security OPSI (a) Overwhelming post splenectomy infection UK Office of Public Sector Information OPTAR – (p) Operational target OPV – (i) Offshore Patrol Vessel
OQ OQ - (i) Order Quantity, in inventory management; the quantity of new items to be ordered. Often expressed as a part of OP/OQ (when quantity OP is reached, order OQ new items)
OR or – (s) Oriya language (ISO 639-1 code) OR – (i) Operating Room (surgery) – Operational/Operations Research – (s) Oregon (postal symbol) - overreciprocation - when the leader of an inner circle friendship contacts a friend more than is wanted or reasonable ORAU – (a/i) Oak Ridge Associated Universities ORB – (a/i) Object Request Broker ORBAT – (p) Order of Battle ORD – (i) O'Hare International Airport in Chicago, Illinois (IATA Airport Code ORD) ORD – (i) Office of Research and Development – Operational Requirements Document ORF – (i) Operational Readiness Float ori – (s) Oriya language (ISO 639-2 code) ORISE – (a) Oak Ridge Institute for Science and Education orm – (s) Oromo language (ISO 639-2 code) ORNL – (i) Oak Ridge National Laboratory ORR – (i) Oak Ridge Reservation (U.S. DOE) – Office of Rail Regulation (UK government) – Office of Refugee Resettlement – (CIA) Office of Research and Reports – Operational Readiness Rate – Operational Readiness Review ORSA – Oxacillin-resistant Staphylococcus aureus – Operations Research Society of America
OS OS – (s) Operating system os – (s) Ossetic language (ISO 639-1 code) Os – (s) Osmium OSA – (i) Order of St. Augustine OSCE – (i) Organization for Security and Co-operation in Europe OSD – (i) U.S. Office of the Secretary of Defense – (i) On-screen Display OSDL – (i) Open Source Development Labs OSE – (a) Own Separate Entrance OSERS – (a) U.S. Department of Education Office of Special Education and Rehabilitative Services OSETI – (a) Optical SETI also Optical SETI OSGeo - (a) Open Source Geospatial Foundation (OSGeo) OSHA – (a) Occupational Safety and Health Administration OSI – (i) Office of Strategic Influence – Ontario Swine Improvement – Open Source Initiative – Open Systems Interconnection OSIA – (i) (U.S.) On-Site Inspection Agency OSL – (i) Open Source License – Optically Stimulated Luminescence – Orbiting Solar Laboratory OSIRIS (a) Optical, Spectroscopic, and Infrared Remote Imaging System (astronomical system on the Rosetta spacecraft) Optical System for Imaging and low Resolution Integrated Spectroscopy (astronomical system on the land-based Gran Telescopio Canarias) OSM – (i) One Saturday Morning OSMF - (a) OpenStreetMap Foundation OSPA – (a) Operations Security Professional's Association site of OSPA OSPA – (i) Oregon School Psychologists Association OSRH – (i) Oružane Snage Republike Hrvatske (en: Armed forces of the Republic of Croatia) oss – (s) Ossetic language (ISO 639-2 code) OSS – (i) Office of Strategic Services (1942–1945, forerunner of CIA) OSU – (i) Ohio State University – Oklahoma State University
OT