| Acronym | Sense | Language | Topics |
|---|---|---|---|
| OMEGA | Outil pour les Mutuelles des Électriciens et GAziers | In French | → Software → Insurance → Energy economics → Electrical engineering |
| OMET | Orbiter Mission Elapsed Time | In English | → Astronautics |
| OMEWG | Orbiter Maintenance Engineering Working Group | In English | → Maintenance and logistics → Astronautics |
| OMI | Organisation Maritime Internationale = IMO | International Maritime Organization | In English = IMO | Internacia Mar-Organizo | In Esperanto |
In French | → International relations → Marine research, oceanography → 6295 → Agricultural sciences |
| OMK | Orbiter Mission Kit | In English | → Astronautics |
| OML | Orbiter Mold Line | In English | → Astronautics |
| OML | Outer Mold Line | In English | → Metallurgy |
| OML | Oddział Metali Lekkich | In Polish | → Research institutes → Metallurgy |
| OMMH | Orbiter Maintenance Man-Hour | In English | → Maintenance and logistics → Astronautics |
| OMR | Orbiter Management Review | In English | → Management → Astronautics |
| OMRF | Orbiter Maintenance and Refurbishment Facility | In English | → Maintenance and logistics → Astronautics |
| OMRF | Orbiter Modification and Refurbishment Facility | In English | → Maintenance and logistics → Astronautics |
| OMS | Orbital Maneuvering System | In English | → Astronautics |
| OMS | Organisation Mondiale de la Santé = MOS | Monda Organiz(aĵ)o pri Sano | In Esperanto = WHO | World Health Organization | In English = OMS | Organizzazione Mondiale della Sanità | In Italian = WGO | Wêreldgesondheidsorganisasie | In Afrikaans = OMS | Organización Mundial de la Salú | In Asturian = СЗО | Световната здравна огранизация | In Bulgarian = SZO | Světová zdravotnická organizace | In Czech = OMS | Organització Mundial de la Salut | In Catalan = OMS | Organización Mundial de la Salud | In Spanish = MTO | Maailma Terviseorganisatsioon | In Estonian = MOE | Munduko Osasun Erakundea | In Basque = OMS | Organisacion mondiâla de la sandât | In Franco-Provençal = OMS | Organización Mundial da Saúde | In Galician = SZO | Svjetska zdravstvena organizacija | In Croatian = RTD | Rêxistina Tendurustiyê ya Dinyayê | In Kurdish = UMS | Urganizazziun mundiala da la Santaa | In Lombard = PSO | Pasaulio sveikatos organizacija | In Lithuanian = PVO | Pasaules veselības organizācija | In Latvian = ÜST | Ümumdünya Səhiyyə Təşkilatı | In Turkish |
In Esperanto | → United Nations → Medicine |
| OMS | Organizzazione Mondiale della Sanità = MOS, WHO, WGO, СЗО, SZO, MTO, MOE, RTD, UMS, PSO, PVO, ÜST (look above) |
In Italian | → United Nations → Medicine |
| OMS | Organización Mundial de la Salú = MOS, WHO, WGO, СЗО, SZO, MTO, MOE, RTD, UMS, PSO, PVO, ÜST (look above) |
In Asturian | → United Nations → Medicine |
| OMS | Organització Mundial de la Salut = MOS, WHO, WGO, СЗО, SZO, MTO, MOE, RTD, UMS, PSO, PVO, ÜST (look above) |
In Catalan | → United Nations → Medicine |
| OMS | Organización Mundial de la Salud = MOS, WHO, WGO, СЗО, SZO, MTO, MOE, RTD, UMS, PSO, PVO, ÜST (look above) |
In Spanish | → United Nations → Medicine |
| OMS | Organisacion mondiâla de la sandât = MOS, WHO, WGO, СЗО, SZO, MTO, MOE, RTD, UMS, PSO, PVO, ÜST (look above) |
In Franco-Provençal | → United Nations → Medicine |
| OMS | Organización Mundial da Saúde = MOS, WHO, WGO, СЗО, SZO, MTO, MOE, RTD, UMS, PSO, PVO, ÜST (look above) |
In Galician | → United Nations → Medicine |
| OMSP | Organización Mundial de la Salud Pública | In Spanish | → Organizations and associations → International relations → Public health and hygiene |
| OMT | Ortopedisen Manuaalisen Terapian | In Finnish | → Medicine |
| OMT | Osteopathic Manipulative Treatment | In English | → Medicine |
| OMT | Oberflächen- und Materialtechnologie GmbH | In German | → Materials science |
| OMT | Ortopedisk manuell terapi | In Swedish | → Surgery, orthopaedics, ophthalmology |
| OMT | Organe de Manœuvre Télécommandé | In French | → Mechanical engineering → Telecommunications |
| OMV | Orbital Maneuvering Vehicle | In English | → Astronautics |
| OMVG | Organisation pour la Mise en Valeur du fleuve Gambie | In French | → Organizations and associations → Development → 5023 → Engineering, technology |
| OMVS | Organisation pour la Mise en Valeur du fleuve Sénégal | In French | → Organizations and associations → 337 → Development → Agricultural sciences |
| ONA | Organizo por Nutrado kaj Agrikulturo = FAO | Food and Agriculture Organization | In English |
In Esperanto | → International relations → Agricultural sciences → Food technology |
| ONBAH | Office National des Barrages et des Aménagements Hydro-agricoles | In French | → Central administration → 627 → Agricultural sciences |
| ONBT | Orbiter Neutral Buoyancy Trainer | In English | → Astronautics |
| ONC | Office National de la Chasse | In French | → Central administration → Fishing, hunting |
| ONCF | Office National des Chemins de Fer | In French | → Transport and postal services |
| ONE | Office National d'Électricité (www.one.org.ma) | In French | → Central administration → Electrical engineering → Morocco |
| ONEP | Office National de l'Eau Potable | In French | → Organizations and associations → Environmental technology, water supply, waste management |
| ONERA | Office National d'Études et de Recherches Aéronautiques | In French | → Aeronautics, aircraft |
| ONERA | Office National d'Études et de Recherches Aérospatiales (www.onera.fr) | In French | → Research institutes → Aeronautics, aircraft → Astronautics → France |
| ONF | Office National des Forêts (www.onf.fr) | In French | → Central administration → Forestry → France |
| ONGC | Oil and Natural Gas Corporation (www.ongcindia.com) | In English | → Earth sciences → Mining |
| ONIAM | Office National d'Indemnisation des Accidents Médicaux (www.oniam.fr) | In French | → Central administration → Accidents, risks, safety → Medicine |
| ONIDOL | Organisation Nationale Interprofessionnelle Des Oléagineux | In French | → Organizations and associations → Agricultural sciences |
| ONISR | Observatoire National Interministériel de la Sécurité Routière | In French | → Central administration → Transport and postal services |
| ONR | Office of Naval Research | In English | → Military engineering |
| ÖNRAP | Österreichisches nationales Radonprojekt | In German | → Medicine → Austria |
| ONREK | Office National de Recherche et d'Évaluation en Kinésithérapie | In French | → Medicine |
| ONS | Opérateur National de Sécurité | In French | → Accidents, risks, safety |
| ONT | Optical Network Terminal | In English | → Networks, communication → Telecommunications |
| ONT | Ontario International Airport (https://www.flyontario.com) | In English | → Transport by air → Canada |
| OOD | Orbiter On Dock | In English | → Astronautics |
| OÖGKK | Oberösterreichische Gebietskrankenkassa (www.ooegkk.at) | In German | → Insurance → Medicine → Austria |
| OOH | Orbital Operations Handbook | In English | → Astronautics |
| OOR | On-Orbit Review | In English | → Astronautics |
| OOS | On-Orbit Station | In English | → Astronautics |
| OOS | Orbit-to-Orbit Shuttle | In English | → Astronautics |
| OOS | Orbit-to-Orbit Stage | In English | → Astronautics |
| OOSD | On-Orbit Support Document | In English | → Astronautics |
| OOSD | Orbital Operations Support Document | In English | → Astronautics |
| OOSDP | On-Orbit Station Distribution Panel | In English | → Astronautics |
| OOSS | On-Orbit Support System | In English | → Astronautics |
| OP | Ordre de Paiement | In French | → Prices → Accounting |
| OPA | Online Publishers Association (www.online-publishers.org) | In English | → Associations → Graphic industries, printing, publishing |
| OPAC | Office Public d'Aménagement et de Construction | In French | → Public administration, government → Construction → Accommodation |
| OPALE | Outil Probabiliste des ALimentations Électriques | In French | → Software → Electrical engineering |
| OPAS | Organização Pan-Americana da Saúde (www.paho.org) = OPS | Organización Panamericana de la Salud | In Spanish = PAHO | Pan American Health Organization | In English |
In Portuguese | → Organizations and associations → International relations → Medicine |
| OPB | Oxidizer Preburner | In English | → Vehicle engineering |
| OPBS | Orbiter Payload Bay Simulator | In English | → Astronautics |
| OPC | Organisation pour la Prévention de la Cécité (www.opc.asso.fr) | In French | → Organizations and associations → Ophthalmology |
| OPC | Opel Performance Center | In English | → Automobile manufacturing |
| OPC | Ordonnancement, Pilotage et Coordination | In French | → Civil engineering → Construction |
| OPC | Optical Proximity Correction | In English | → Graphic industries, printing, publishing |
| OPDQ | Ordre Professionnel des Diététistes du Québec | In French | → Organizations and associations → Personal health and hygiene → Canada |
| OPEC | Organization of the Petroleum Exporting Countries = OPEP | Organisation des Pays Exportateurs de Pétrole | In French = OPEC | Organization of Petroleum Exporting Countries | In English = OPEL | Organizaĵo de Petrol-Eksportaj Landoj | In Esperanto = OPEP | Organização dos Países Exportadores de Petróleo | In Portuguese = OPEP | Organización de Países Esportadores de Petroleu | In Asturian = OPEP | Organización de Países Exportadores de Petróleo | In Spanish = OPEP | Organització de Països Exportadors de Petroli | In Catalan = ОПЕК | Организација на земји извознички на нафта и нафтени деривати | In Macedonian |
In English | → Organizations and associations → Mining → 665 |
| OPEC | Organization of Petroleum Exporting Countries = OPEP, OPEL, ОПЕК (look above) |
In English | → Organizations and associations → Mining → 665 |
| OPECST | Office Parlementaire d'Évaluation des Choix Scientifiques et Technologiques | In French | → Parliaments, representation → Research policy → Engineering, technology |
| OPEL | Organizaĵo de Petrol-Eksportaj Landoj = OPEC, OPEP, ОПЕК (look above) |
In Esperanto | → Organizations and associations → Mining → 665 |
| OPEN | Organisation de Producteurs d'Énergie Nucléaire | In French | → Organizations and associations → Energy economics → Nuclear technology |
| OPEP | Organisation des Pays Exportateurs de Pétrole = OPEC, OPEL, ОПЕК (look above) |
In French | → Chemical technology → Mining → 665 |
| OPEP | Organização dos Países Exportadores de Petróleo = OPEC, OPEL, ОПЕК (look above) |
In Portuguese | → Organizations and associations → Mining → 665 |
| OPEP | Organización de Países Esportadores de Petroleu = OPEC, OPEL, ОПЕК (look above) |
In Asturian | → Organizations and associations → Mining → 665 |
| OPEP | Organización de Países Exportadores de Petróleo = OPEC, OPEL, ОПЕК (look above) |
In Spanish | → Organizations and associations → Mining → 665 |
| OPEP | Organització de Països Exportadors de Petroli = OPEC, OPEL, ОПЕК (look above) |
In Catalan | → Organizations and associations → Mining → 665 |
| OPERA | Observatoire PErmanent de la RAdioactivité | In French | → Organizations and associations → Nuclear technology |
| OPEX | OPerational Expenditure | In English | → Accounting |
| OPF | Orbiter Processing Facility | In English | → Astronautics |
| OPI | Orbiter Payload Interrogator | In English | → Astronautics |
| OPI | Office du Périmètre d'Irrigation | In French | → Public administration, government → Agricultural sciences |
| OPIS | Orbiter Prime Item Specification | In English | → Astronautics |
| OPK | Ovulation Predictor Kit | In English | → Gynaecology → Reproductive biology |
| OPL | Orbiter Project Parts List | In English | → Astronautics |
| OPLF | Orbiter Processing and Landing Facility | In English | → Astronautics |
| OPM | Outer Planet Mission | In English | → Astronomy → Astronautics |
| OPO | Orbiter Project Office | In English | → Astronautics |
| OPOV | Oxidizer Preburner Oxidizer Valve | In English | → Vehicle engineering |
| OPPAR | Orbiter Project Parts Authorization Request | In English | → Astronautics |
| OPPBTP | Organisme Professionnel de la Prévention du Bâtiment Travaux Publics | In French | → Organizations and associations → Civil engineering → Construction |
| OPPBTP | Organisme Professionnel de Prévention du Bâtiment et des Travaux Publics (www.oppbtp.fr) | In French | → Organizations and associations → Labour, labour economics → Medicine → Civil engineering → Construction → France |
| OPPBTP | Organisme Professionnel de la Prévention du Bâtiment et des Travaux Publics (www.oppbtp.fr) | In French | → Organizations and associations → Construction → Civil engineering |
| OPPF | Oxford Protein Production Facility | In English | → Biotechnology → Proteins |
| OPPTIC | Organisation de Professionnels pour la Promotion des TIC en région Languedoc-Roussillon | In French | → Networks, communication → Organizations and associations → Telecommunications |
| OPQCM | Office Professionnel de Qualification des Conseils en Management | In French | → Consulting |
| OPR | Orbiter Payload Recorder | In English | → Astronautics |
| OPRI | Office de Protection contre les Rayonnements Ionisants (www.opri.fr) | In French | → Organizations and associations → Nuclear technology |
| OPS | Orbiter Project Schedule | In English | → Astronautics |
| OPS | Organización Panamericana de la Salud (www.paho.org) = OPAS, PAHO (look above) |
In Spanish | → Organizations and associations → International relations → Medicine |
| OPSIS | Observation et Prospective sur la Société de l'Information et ses Services | In French | → Computer science → Telecommunications |
| OPSS | Orbital Propellant Storage Subsystem | In English | → Astronautics |
| OPT | Opérations de Patrimoine et Trésorerie | In French | → Accounting |
| OPT | Opération de Patrimoine et Trésorerie | In French | → Finance → Accounting |
| OptCo | Optics Communications | In English | → Serial publications, periodicals → Optics → Telecommunications |
| OptFT | Optical Fiber Technology | In English | → Serial publications, periodicals → Optics → Telecommunications |
| OPTI | Observatorio de Prospectiva Tecnológica Industrial | In Spanish | → Engineering, technology |
| OPTILE | Organisation Professionnelle des Transports d'Île-de-France | In French | → Organizations and associations → Transport and postal services → France |
| OptMa | Optical Materials | In English | → Serial publications, periodicals → Optics → Materials science |
| OptQE | Optical Quantum Electronics | In English | → Serial publications, periodicals → Quantum mechanics → Optics → Engineering, technology |
| OPWC | Organisation for the Prohibition of Chemical Weapons (www.opcw.org) = OIAC | Organisation pour l'Interdiction des Armes Chimiques | In French |
In English | → Organizations and associations → International relations → Military engineering |
| OPWS | Orbital Payload Work Station | In English | → Astronautics |
| OQE | Optical and Quantum Electronics | In English | → Serial publications, periodicals → Quantum mechanics → Optics → Engineering, technology |
| ORAC | Oxygen Radical Absorbance Capacity | In English | → Biochemistry, biophysics → Nutrition |
| ORCUS | Orbital Recording Capability and Update System | In English | → Astronautics |
| ORD | Orbital Requirements Document | In English | → Astronautics |
| ORD | Office of Rare Diseases (http://rarediseases.info.nih.gov) | In English | → 345 → Pathology |
| ORE | Opérateur de Réseau Électricité | In French | → Energy economics → Electrical engineering |
| ORF | Österreichischer Rundfunk (http://orf.at) | In German | → Telecommunications → Austria |
| ÖRG | Österreichische Röntgengesellschaft (www.oerg.at) | In German | → Organizations and associations → Medicine → Austria |
| ORG | Opérateur de Réseau Gaz | In French | → Energy economics |
| ORGÉV | Omnium de Recherche sur la Génétique du Vieillissement | In French | → Biotechnology |
| ORIC | ORganisation Informatique Comptable | In French | → Computer science → Accounting |
| ORM | Operational Reactivity Margin | In English | → 53912 → Nuclear technology |
| ÖRPE | Österreichische Referenzzentrum zur Erfassung und Dokumentation von menschlichen Prionenerkrankungen | In German | → Documentation → Pathology → Austria |
| ORPHEM | Organisation Régionale des Pharmaciens Hospitaliers de l'Est Méditerranéen | In French | → Organizations and associations → Pharmacology, toxicology |
| ORR | Ordre de Réduction de Recettes | In French | → Accounting |
| ORS | Outer Root Sheath | In English | → Anatomy |
| ORS | Österreichische Rundfunksender (www.ors.at) | In German | → Telecommunications → Austria |
| ORS | Orbital Refueling System | In English | → Astronautics |
| ORS | Orbital Reservicing System | In English | → Astronautics |
| ORS | Orbital Resupply System | In English | → Astronautics |
| ORT | Orbit Readiness Test | In English | → Astronautics |
| ORTA | Organisme de Ràdio i Televisió d'Andorra | In Catalan | → Telecommunications → Andorra |
| ORTAS | Organisme de la Radio-Télévision Arabe Syrienne | In French | → Telecommunications |
| ORU | Orbital Replaceable Unit | In English | → Astronautics |
| ORU | Orbital Replacement Unit | In English | → Astronautics |
| ORV | Orbital Research Vehicle | In English | → Astronautics |
| OS | On-orbit Station | In English | → Astronautics |
| OS | Orbiter CEI Specification | In English | → Astronautics |
| OSART | Operational Safety Assessment Review Team | In English | → Nuclear technology |
| OSB | Orientated Strand Board | In English | → Timber and woodworking industry |
| OSC | Orbital Sciences Corporation | In English | → Astronautics |
| OSCAR | Orbiting Satellite Carrying Amateur Radio | In English | → Astronautics → Telecommunications |
| OsCar | Osteoarthritis and Cartilage | In English | → Serial publications, periodicals → Medicine |
| OSCN | Orbiter Specification Change Notice | In English | → Astronautics |
| OSCR | Orbiter Software Change Request | In English | → Software → Astronautics |
| OSCRS | Orbital Spacecraft Consumables Resupply System | In English | → Maintenance and logistics → Astronautics |
| OSDH | Orbiter System Definition Handbook | In English | → Astronautics |
| OSE | Orbital Support Equipment | In English | → Astronautics |
| OSF | Orbiter Simulation Facility | In English | → Astronautics |
| ÖSG | Österreichische Schmerzgesellschaft (www.oesg.at) | In German | → Organizations and associations → Pathology → Austria |
| ÖSG | Österreichischer Strukturplan Gesundheit | In German | → Medicine → Austria |
| OSGE | Observatoire Statistique du Groupe EDF | In French | → Energy economics → Electrical engineering |
| OSHA | Occupational Safety and Health Administration (www.osha.gov) | In English | → Central administration → Accidents, risks, safety → Labour, labour economics |
| OSHA | Occupational Safety and Health Act | In English | → Accidents, risks, safety → Labour, labour economics → Medicine |
| OSIRIS | Observatoire des Systèmes d'Informations, des Réseaux et des Inforoutes au Sénégal (www.osiris.sn) | In French | → Organizations and associations → Software → Networks, communication → Telecommunications |
| OSM | On-Orbit Spares Model | In English | → Astronautics |
| OSM | Orbiter Service Module | In English | → Astronautics |
| OSO | Orbiting Solar Observatory | In English | → Astronautics → Observatories → Solar system |
| OSOP | Orbiter Systems Operating Procedure | In English | → Astronautics |
| OSP | Office of Space Planning | In English | → Construction |
| OSQC | Outil Standard de la Qualité Comptable | In French | → Accounting |
| OSR | Oberster Sanitätsrat | In German | → Organizations and associations → Public health and hygiene |
| OSS | Office of Space Sciences | In English | → Astronomy → Astronautics |
| OSS | Orbiting Space Station | In English | → Astronautics |
| OSSA | Office of Space Science and Applications | In English | → Astronomy → Astronautics |
| OSSA | Office of Space Sciences and Applications | In English | → Astronomy → Astronautics |
| OSSIU | Orbiter-Space Station Interface Unit | In English | → Human-computer interaction → Astronautics |
| OSSRH | Orbiter Subsystem Requirements Handbook | In English | → Astronautics |
| OST | Orbiter Support Trolley | In English | → Astronautics |
| OST | Office of the Secretary of Transportation | In English | → Central administration → Transport and postal services |
| OSTA | Office of Space and Terrestrial Applications | In English | → Astronomy → Astronautics |
| OSTDS | Office of Space Tracking and Data Systems | In English | → Data → Astronautics |
| OSTO | Office of Space Transportation Operations | In English | → Astronautics |
| OSTP | Office of Science and Technology Policy | In English | → Research policy → Engineering, technology |
| OSTP | Orbiting System Test Plan | In English | → Astronautics |
| OSTS | Office of Space Transportation Systems | In English | → Astronautics |
| OT | Occupational Therapy | In English | → Medicine → Labour, labour economics |
| OT | Organisation Todt | In French | → Military engineering → History |
| OT | Ohjelmistotekniikka = IT | Information Technology | In English = IT | Informationstechnik | In German = IT | Inligtingstegnologie | In Afrikaans = TI | Tecnologia da Informação | In Portuguese = TI | Tecnoloxías da información | In Galician = UT | Upplýsingatækni | In Icelandic = IT | Informationsteknik | In Swedish = IT | Informacijska Tehnologija | In Slovenian = IT | Informačné Technológie | In Slovak = ІТ | Інформаційні технології | In Ukrainian = ИТ | Информационные технологии | In Russian = IT | Informa Teknologio | In Esperanto = TI | Tecnologías de la Información | In Spanish = IT | Informacinės Technologijos | In Lithuanian = IT | Informācijas Tehnoloģijas | In Latvian |
In Finnish | → Computer science → Telecommunications |
| OTA | Operational Trajectory Analysis | In English | → Aeronautics, aircraft → Astronautics |
| OTB | Orbiting Tanker Base | In English | → Astronautics |
| OTC | Orbiter Test Conductor | In English | → Astronautics |
| OTC | Over the Counter | In English | → Pharmacology, toxicology |
| OTD | Operational Technical Documentation | In English | → Engineering, technology |
| OTD | Orbiter Test Director | In English | → Astronautics |
| OTE | Orbital Transfer Equipment | In English | → Astronautics |
| OTEC | Ocean Thermal Energy Conversion | In English | → Energy economics |
| ÖTI | Österreichisches Textil-Forschungsinstitut (www.oeti.at) | In German | → Research institutes → Textile industry → Austria |
| OTL | Office of Technology Licensing | In English | → Engineering, technology |
| OTLC | Orbiter Time Line Constraint | In English | → Astronautics |
| OTOS | Orbit-To-Orbit Stage | In English | → Astronautics |
| OTP | Operational Test Procedure | In English | → Engineering, technology |
| OTP | Operations Turnaround Plan | In English | → Engineering, technology |