| Acronym | Sense | Language | Topics |
|---|---|---|---|
| OC | Organisme Comptable | In French | → Accounting |
| OCC | Organisme Comptable de Centralisation | In French | → Accounting |
| OCCARO | Orange County Council of Amateur Radio Organizations | In English | → Organizations and associations → Telecommunications |
| OCDU | Optical Channel Drop Unit | In English | → Telecommunications → Optics |
| OCRACES | Orange County Radio Amateur Civil Emergency Service | In English | → Telecommunications |
| OCT | Ordre Complémentaire de Transmission | In French | → Telecommunications |
| OCT | Ordre Complémentaire pour les Transmissions | In French | → Military affairs → Telecommunications |
| OCW | Opzoekingscentrum voor de Wegenbouw | In Dutch | → Transport and postal services |
| ODE | Occasion d'Entendre | In French | → Advertising |
| ODICE | Outil de Diagnostic Interne Comptable de l'Éducation Nationale | In French | → Accounting → Central administration → Education |
| ODV | Occasion De Voir | In French | → Advertising |
| OEST | Observatoire Économique et Statistique des Transports | In French | → Statistics → Economics → Transport and postal services |
| OFC | Organisme Fisco-Comptable | In French | → Taxes, duties → Accounting |
| OFDM | Orthogonal Frequency Division Multiplexing | In English | → Networks, communication → Telecommunications |
| OFDM | Orthogonal Frequency-Division Multiplexing | In English | → Computer science → Telecommunications |
| ÖIAT | Österreichisches Institut für angewandte Telekommunikation (www.oiat.at) | In German | → Research institutes → Telecommunications → Austria |
| OIBDA | Operating Income Before Depreciation and Amortization | In English | → Accounting → Finance |
| OIE | Opérations Inter-Établissements | In French | → Accounting |
| OIO | Opérations Inter-Organismes | In French | → Accounting |
| OIS | Operational Intercommunication System | In English | → Telecommunications |
| OJD | Office de Justification de la Diffusion des Supports de Publicité | In French | → Advertising |
| OLT | Optical Line Terminal | In English | → Telecommunications |
| OMCS | Operations and Maintenance Communications System | In English | → Maintenance and logistics → Telecommunications |
| OMT | Organe de Manœuvre Télécommandé | In French | → Mechanical engineering → Telecommunications |
| ONCF | Office National des Chemins de Fer | In French | → Transport and postal services |
| ONISR | Observatoire National Interministériel de la Sécurité Routière | In French | → Central administration → Transport and postal services |
| ONT | Optical Network Terminal | In English | → Networks, communication → Telecommunications |
| ONT | Ontario International Airport (https://www.flyontario.com) | In English | → Transport by air → Canada |
| OP | Ordre de Paiement | In French | → Prices → Accounting |
| OPA | Online Publishers Association (www.online-publishers.org) | In English | → Associations → Graphic industries, printing, publishing |
| OPC | Optical Proximity Correction | In English | → Graphic industries, printing, publishing |
| OPEX | OPerational Expenditure | In English | → Accounting |
| 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 |
| OPSIS | Observation et Prospective sur la Société de l'Information et ses Services | In French | → Computer science → Telecommunications |
| 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 |
| OPTILE | Organisation Professionnelle des Transports d'Île-de-France | In French | → Organizations and associations → Transport and postal services → France |
| ORF | Österreichischer Rundfunk (http://orf.at) | In German | → Telecommunications → Austria |
| ORIC | ORganisation Informatique Comptable | In French | → Computer science → Accounting |
| ORR | Ordre de Réduction de Recettes | In French | → Accounting |
| ORS | Österreichische Rundfunksender (www.ors.at) | In German | → Telecommunications → Austria |
| ORTA | Organisme de Ràdio i Televisió d'Andorra | In Catalan | → Telecommunications → Andorra |
| ORTAS | Organisme de la Radio-Télévision Arabe Syrienne | In French | → Telecommunications |
| OSCAR | Orbiting Satellite Carrying Amateur Radio | In English | → Astronautics → Telecommunications |
| 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 |
| OSQC | Outil Standard de la Qualité Comptable | In French | → Accounting |
| OST | Office of the Secretary of Transportation | In English | → Central administration → Transport and postal services |
| 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 |
| OTV | Operational Television | In English | → Telecommunications |
| OUP | Oxford University Press | In English | → Higher education, universities → Graphic industries, printing, publishing |
| OVCO | Operational Voice Communication Office | In English | → Telecommunications |
| ÖVG | Österreichische Verkehrswissenschaftlichen Gesellschaft (www.oevg.at) | In German | → Organizations and associations → Transport and postal services → Austria |
| ÖVN | Österreichischer Verein für Navigation (www.ovn.at) = AIN | Austrian Institute of Navigation | In English |
In German | → Organizations and associations → Geodesy, cartography → Transport and postal services → Austria |
| ÖVSV | Österreichischer Versuchssenderverband | In German | → Organizations and associations → Telecommunications → Austria |
| OWF | Optimum Working Frequency | In English | → Telecommunications |
| OXCs | Optical cross connects | In English | → Telecommunications |
| P&T | Post en Telegraaf | In Dutch | → Telecommunications → Transport and postal services |
| P&TE | Packaging and Transport Engineering | In English | → Transport and postal services |
| P3I | Planning, Performance, Process & Innovative Solutions | In English | → Consulting → Economics → Public administration, government |
| PA | Petites Annonces | In French | → Graphic industries, printing, publishing |
| PAA | Pan American Airlines | In English | → Transport by air |
| PAF | Piste d'Audit Fiscal | In French | → Accounting → Taxes, duties |
| PAGCH | Packet Access Grant Channel | In English | → Telecommunications |
| PAH | Port Autonome du Havre | In French | → Transport and postal services |
| PAL | Phase Alternated Line | In English | → Telecommunications |
| PAM | Port Autonome de Marseille (www.marseille-port.fr) | In French | → Transport and postal services → France |
| PAMPAS | Pioneering Advanced Mobile Privacy and Security (www.pampas.eu.org) | In English | → Computer-based techniques → Telecommunications |
| PAPI | Precision Approach Path Indicator | In English | → Transport and postal services → Aeronautics, aircraft |
| PAR | Precision Approach Radar | In English | → Transport and postal services → Aeronautics, aircraft |
| PARS | Property Accountability Record System | In English | → Records management → Accounting |
| PARS | Property Accounting and Reporting System | In English | → Accounting |
| PARS | Programmed Airline Reservation System | In English | → Software → Transport by air → Tourism |
| PASTI | Public Address Speech Transmission Index | In English | → Telecommunications → Acoustical engineering |
| PATH | Partners for Advanced Transit and Higways | In English | → Organizations and associations → Transport and postal services |
| PATRACDR | Personnel, Armement, Tenue, Radio, Alimentation, Commandement, Déroulement, Rendez-vous | In French | → Firefighting → Telecommunications |
| PB | Point de Branchement | In French | → Telecommunications |
| PBB | Provider Backbone Bridge | In English | → Networks, communication → Telecommunications |
| PBB-TE | Provider Backbone Bridge - Traffic Engineering | In English | → Networks, communication → Telecommunications |
| PBBN | Provider Backbone Bridge Network | In English | → Networks, communication → Telecommunications |
| PBEB | Provider Backbone Edge Bridge | In English | → Networks, communication → Telecommunications |
| PBS | Public Broadcasting Service | In English | → Telecommunications |
| PBT | Provider Backbone Transport | In English | → Networks, communication → Telecommunications |
| PBX | Private Branch Exchange | In English | → Telecommunications |
| PC | Piste Cyclable | In French | → Road transport → Sport, physical exercises |
| PCA | Plan Comptable Analytique | In French | → Accounting |
| PCAM | Punched-Card Accounting Machine | In English | → Computer hardware → Accounting |
| PCAM | Poste de Commandement pour Appels Multiples | In French | → Telecommunications |
| PCG | Plan Comptable Général | In French | → Accounting |
| PCI | Peripheral Component Interconnect | In English | → Computer hardware → Telecommunications |
| PCM | Plan Communal de Mobilité | In French | → Public administration, government → Regional planning → Transport and postal services |
| PCMR | Probability of Correct Message Receipt | In English | → Telecommunications |
| PCN | Plan Comptable National | In French | → Accounting |
| PCTC | Pentagon Consolidated Telecommunications Center | In English | → Telecommunications → Military affairs |
| PDA | Personal Digital Assistant | In English | → Computer science → Telecommunications |
| PDE | Plan de Déplacement d'Entreprise | In French | → Transport and postal services |
| PDH | Plesiochronous Digital Hierarchy | In English | → Telecommunications → Networks, communication |
| PDU | Plan de Déplacements Urbains | In French | → Transport and postal services |
| PDU | Plan de Déplacement Urbain | In French | → Regional planning → Transport and postal services |
| PDUIF | Plan de Déplacements Urbains d'Ile-de-France | In French | → Public administration, government → Transport and postal services → France |
| PDZ | Point de Distribution de Zone | In French | → Telecommunications |
| PEI | Projet Entreprise Innovante | In French | → 3384 → 650115 |
| PES | Photoelectric Scanner | In English | → Electronics → Graphic industries, printing, publishing |
| PET | Persona-Enabling Toolkit | In English | → Networks, communication → Telecommunications |
| PFM | Pulse Frequency Modulation | In English | → Telecommunications |
| PFN | Pulse Forming Network | In English | → Telecommunications |
| PG | Parental Guidance | In English | → Cinema, movies → Telecommunications |
| PGA | Prévision de Gestion Annuelle | In French | → Finance → Accounting |
| PHB | Per Hop Behavior | In English | → Networks, communication → Telecommunications |
| PHI | Prix Horaire d'Immobilisation | In French | → Prices → Accounting |
| PHST | Packaging, Handling, Storage, and Transportation | In English | → Maintenance and logistics → Transport and postal services |
| PHTR | Packaging, Handling, and Transportation Record | In English | → Records management → Maintenance and logistics → Transport and postal services |
| PIC | Plate-forme Industrielle Courrier | In French | → Postal services → France |
| PICS | Protocol Implementation Conformance Statement | In English | → Standardization → Networks, communication → Telecommunications |
| PIG | Principaux Indicateurs de Gestion | In French | → Accounting |
| PIM | Portail Intranet Mobile | In French | → Networks, communication → Telecommunications |
| PIN | Personal Identification Number | In English | → Telecommunications |
| PIN | Persoonlijk Identificatienummer | In Dutch | → Computer science → Telecommunications |
| PIO | Public Information Officer | In English | → 659 |
| PIO | Public Information Office | In English | → Libraries → 659 |
| PJCC | Pièce de Journal de la Comptabilité Centrale = CAJV | Central Accounting Journal Voucher | In English |
In French | → Accounting |
| PL | Private Line | In English | → Telecommunications |
| PLC | Power Line Communication | In English | → Electrical engineering → Telecommunications |
| PLM | Paris Lyon Marseille | In French | → Transport and postal services → France |
| PLM | Paris Lyon Méditerranée | In French | → Transport and postal services → France |
| PLMN | Public Land Mobile Network | In English | → Telecommunications |
| PLT | Powerline Telecommunications | In English | → Telecommunications |
| PM | Phase Modulation | In English | → Telecommunications |
| PME | Personal Mobile Radio | In English | → Telecommunications |
| PMN | Parent, McLaughlin and Nangle (www.pmn.com) | In English | → Economics → Consulting |
| PMN | Private Mobile Networks | In English | → Telecommunications |
| PMV | Panneaux à Messages Variables | In French | → Graphic industries, printing, publishing |
| PNC | Personnel Navigant Commercial | In French | → Transport and postal services |
| PNC | Pôle National de Comptabilité | In French | → Accounting |
| PNK | Personalnebenkosten | In German | → Labour, labour economics → Accounting |
| POM | Printer Output Microfilm | In English | → Graphic industries, printing, publishing |
| POTS | Plain Old Telephone Service | In English | → Telecommunications |
| POV | Privately Owned Vehicle | In English | → Vehicle engineering → Transport and postal services |
| PPC | Pay per click | In English | → 659 |
| PPCH | Packet Paging Channel | In English | → Telecommunications |
| PPDC | Plate-forme de Préparation et de Distribution du Courrier | In French | → Postal services → France |
| PPL | Private Pilot Licence | In English | → Transport by air |
| PPLMN | Periodic Public Land Mobile Network | In English | → Telecommunications |
| PPTE | Periodica Polytechnica Transportation Engineering | In English | → Serial publications, periodicals → Vehicle engineering → Transport and postal services |
| PR | Public Relations = RP | Relations Publiques | In French = RP | Relations Presse | In French |
In English | → Public relations |
| PRACH | Packet Random Access Channel | In English | → Telecommunications |
| PRC | Provision pour Risques et Charges | In French | → Accounting |
| PREDIT | Programme National de Recherche et d'Innovation dans les Transports Terrestres | In French | → Vehicle engineering → Transport and postal services |
| PRF | Pulse Repetition Frequency | In English | → Telecommunications |
| PRI | Point de Raccordement Immeuble | In French | → Telecommunications |
| PRI | Primary Rate Interface | In English | → Telecommunications |
| PRINCE | PRojet d'INfrastructure de Communication d'Entreprise | In French | → Networks, communication → Telecommunications |
| PRISCILLA | Bus PRiority strategies and Impact SCenarIos deveLoped on a Large urban Area | In English | → Transport and postal services |
| PRISM | Pacific Regional Information SysteM | In English | → Computer science → Telecommunications |
| PROMU | Prospective de la Mobilité dans les Métropoles | In French | → Transport and postal services → Regional planning |
| PRR | Pulse Repetition Rate | In English | → Telecommunications |
| PRS | (Syndicat National des) Papetiers Répartiteurs Spécialisés | In French | → Organizations and associations → Graphic industries, printing, publishing → Paper and board industry |
| PRVA | Public Relations Verband Austria (www.prva.at) | In German | → Organizations and associations → Public relations → Austria |
| PSCN | Program Support Communications Network | In English | → Networks, communication → Telecommunications |
| PSDU | Power and Signal Distribution Unit | In English | → Energy economics → Electrical engineering → Telecommunications |
| PSIU | Power and Signal Interface Unit | In English | → Energy economics → Electrical engineering → Telecommunications |
| PSK | Phase-Shift Keying | In English | → Telecommunications |
| PSMI | Pryde Schropp McComb, Inc (www.psmi.ca) | In English | → Civil engineering → Transport and postal services → Canada |
| PSO | ProzessStandard Offsetdruck | In German | → Graphic industries, printing, publishing |
| PSP | Programmable Signal Processor | In English | → Software → Telecommunications |
| PSTN | Public Switched Telephone Network = RTCP | Réseau Téléphonique Commuté Public | In French = ТСОП | елефонная сеть общего пользования | In Russian |
In English | → Telecommunications |
| PT | Post- og Teletilsynet | In Norwegian | → Telecommunications → Transport and postal services |
| PTC | Радио-телевизија Србије (www.rts.co.yu) = RTS | Radio Televizija Srbije | In Serbian |
In Serbian | → Telecommunications |
| PTCR | Pad Terminal Connection Room | In English | → Telecommunications |
| PTN | Publika telefonnätet | In Swedish | → Telecommunications |
| PTS | Per-Trunk Signaling | In English | → Telecommunications |
| PTT | Poŝto, Telegrafo kaj Telefono | In Esperanto | → Telecommunications → Transport and postal services |
| PTT | Post Telegraaf Telefoon | In Dutch | → Telecommunications → Transport and postal services |
| PVC | Permanent Virtual Circuit | In English | → Telecommunications |
| QAM | Quadrature Amplitude Modulation | In English | → Telecommunications |
| QANTAS | Queensland And Northern Territories Airline System (https://www.qantas.com) | In English | → Transport by air → Australia |
| QE | Quittancement Élaboré | In French | → Accounting |
| QPSK | Quadrature Phase-shift keying | In English | → Telecommunications |
| R&CC | Recorder and Communication Control | In English | → Telecommunications |
| R&T | Réseaux & Télécoms | In French | → Networks, communication → Telecommunications |
| RAAP | Red Académica Peruana | In Spanish | → Computer science → Higher education, universities → Telecommunications |
| RABF | Radio Astronomy Bandstop Filter | In English | → Astronomy → Telecommunications |
| RACC | Radio Advertising Clearance Centre | In English | → Telecommunications → 659 |
| RACES | Radio Amateur Civil Emergency Service | In English | → Telecommunications |
| RACH | Random Access Channel | In English | → Telecommunications |
| RADAR | RAdio Detection And Ranging | In English | → Telecommunications |
| RADIUS | Remote Authentication Dial In User Service | In English | → Networks, communication → Telecommunications |
| RaEE | Radio and Electronic Engineer | In English | → Serial publications, periodicals → Telecommunications → Electronics |
| RAGIE | Red Avanzada Guatemalteca para la Investigación y Educación | In Spanish | → Computer science → Education → Mathematics and natural sciences → Telecommunications |
| RAI | Radio Audizioni Italiane (www.rai.it) | In Italian | → Telecommunications → Italia |
| RAI | Radiotelevisione Italiana (www.rai.it) | In Italian | → Telecommunications → Italia |
| RAI | Résultat Avant Impôt | In French | → Accounting → Taxes, duties |
| RAICES | Red Avanzada de Investigación, Ciencia y Educación Salvadoreña | In Spanish | → Computer science → Education → Mathematics and natural sciences → Telecommunications |
| RAISOM | Réseaux de collecte IP Sans Fil Optimisés | In French | → Networks, communication → Telecommunications |
| RAMAC | Random Access Method of Accounting And Control | In English | → Accounting |
| RAN | Report À Nouveau | In French | → Accounting |
| RAP | Responsibility Accounting Program | In English | → Accounting |
| RAP | Reprise des Amortissements et Provisions | In French | → Accounting |