OAA Ontario Automobile Association OAB Ocean Affairs Board OAC Oceanic Area Control [Center] OAD Open Architecture Driver OAE Operational Area Evaluation OAF Objective Award Fee OAF Origin Address Field OAF Originating Address Format OAF [GNOME] Object Activation Framework OAG Office of the Auditor-General OAG Official Airline Guide OAG Open Applications Group OAG Overly Attached Girlfriend OAH Organization of American Historians OAI Open APIs Initiative OAI Open Applications Interface OAI Open Archives Initiative OAI Organisational Activity Interface OAJ Oregon Athletics Journal OAK Object Application Kernel OAL OEM Adaptation Layer OAL Other AirLine OAL [EFF] Open Audio License OAM Object Allocation Map OAM Object Authority Manager OAM On A Mission OAM Open Application Model OAM Operation, Administration and Maintenance OAM Optical Absorption Microscope OAM Orbital Angular Momentum OAM Order of Australia Medal OAN One America News OAN Overshoot Amplitude Noise OAO Orbiting Astronomical Observatory OAO Over And Out OAP Old Age Pensioner OAP Open Automated Protocol OAP Operating and Administrative Procedures OAQ Office of Air Quality OAR Office of Aid Representation OAR Office of Air and Radiation OAR [Office of] Oceanic and Atmospheric Research OAS Office Automation System OAS Open Application Server OAS Open Atmospheric Society OAS OpenAPI Specification OAS Organization of American States OAS Original Antigenic Sin OAT Operational Air Traffic OAT Optional Auxiliary Terminal OAT Optometry Admission Test OAT Outside Air Temperature OAU Organisation of African Unity OAV Original Animation Videos OAW On Another World OAX Object-oriented API for XML OAY Outstanding Airman of the Year OAZ Ones And Zeros OBA Object Behavior Analysis OBA One Block Ahead OBA Oxygen Breathing Apparatus OBB Olivier Berendinus Bommel OBB Operating Budget Baseline OBB Oriented Bounding Box OBC On Board Checkout OBC On-Board Computer OBC Outside Back Cover OBD Object-Based Disks OBD On-Board Diagnostic OBD [SUN] Online Bugs Database OBE Officer of the British Empire OBE Order of the British Empire OBE Ordinary Bloody Effort OBE Out-of-Body Experience OBE Overcome By Events OBF Ordering and Billing Forum OBH Oh Bloody Hell OBI Open Bolt Indicator OBI Open Buying on the Internet OBI Originating Beneficiary Information OBJ Ottawa Business Journal OBK Oppenheimer-Brinkman-Kramers OBL Object-Based Language OBL One Block Lookahead OBL Osama Bin Laden OBM Original Brand Manufacturer OBM OutBoard Motor OBN Open Business Network OBO Or Best Offer OBP On Base Percentage OBP On-Board Processing OBP Online Browsing Platform OBP Outer Balance Piston OBQ One Big Query OBQ Overture for Brass Quintet OBR Office of Budget Responsibility OBR Open Business Report OBR Optical Beam Rider OBS OMNI Bearing Selector OBS Open Build System OBS Optical Boresight System OBS Optical Burst Switching OBS Orbital Bombardment System OBS Organisational Breakdown Structure OBS Organization for Black Struggle OBT Orange Blossom Trail OBU On-Board Unit OBU OSIS Baseline Upgrade OBV OBligated Volunteer OBW OneBlueWorld, Incorporated OBY Outreach Baptist Youth OBZ On Beyond Zebra OCA Offensive Counter Air OCA Online Covert Action OCA Open Content Alliance OCA Operational Control Authority OCA OPTEC Contracting Authority OCA Oracle Contributor Agreement OCA Original Classification Authority OCB Oil Circuit Breaker OCC Office Communications Cabinet OCC Office of the Comptroller of the Currency OCC Operations Control Center OCC Optical Channel Carrier OCC Optimistic Concurrency Control OCC Originating Call Control OCC Other Common Carrier OCD Obsessive Christmas Disorder OCD Obsessive-Compulsive Disorder OCD Occupational Cervicobrachial Disorders OCD Online Compulsive Disorder OCD Operational Concept Document OCD Operational Control Dashboard OCD Organized Crime Division OCD Over-Compensating Dude OCE One-Center Expansion OCF Open Computing Facility OCF Open Container Format OCF OpenCard Framework OCF Operating Cash Flow OCF Operations Control Facility OCG Operational Coordination Group OCG Optical Carrier Group OCH Off-Campus Housing OCH OilCan Harry's OCI Object Computing, Incorporated OCI Object Content Information OCI Office of Compliance and Inspections OCI Open Circuit Interval OCI Open Connection Indication OCI Open Container Initiative OCI Oracle Call Interface OCI Out of City Indicator OCJ Orthodox Church in Japan OCL Office of Congressional Liaisons OCL Open Client Library OCL [UML] Object Constraint Language OCM Object Code Maintained OCM Office Carrier Module OCM On Condition Monitoring OCM Open Code Market OCN Open Computer Network OCO Object Code Only OCO Orbiting Carbon Observatory OCO Overseas Contingency Operations OCP Office of Civilian Personnel OCP Omni Consumer Products OCP Open Compute Project OCP Open-Closed Principle OCP Operational Capability Plan OCP Oracle Certified Professional OCP Over Current Protection OCR Office of Civil Rights OCR On-Call Review OCR Optical Character Recognition OCS Occult Crime Squad OCS Officer Candidate School OCS Old Church Slavonic OCS Operational Control System OCS Optical Convergence Switch OCS Outer Continental Shelf OCS Overseas Courier Service OCS [Amiga] Original ChipSet OCU Office Channel Unit OCU Operational Conversion Unit OCU Orthodox Church of Ukraine OCV Operational-Compliance Value OCW Old Cars Weekly OCW Overseas Contract Workers OCX OLE Control eXtensions OCY Office for Children and Youth ODA Object Discovery Agent ODA Official Development Aid ODA Open Data Application ODA Open Document Architecture ODA Operational Detachment Alpha ODA OverDeveloped Amateurs ODA Overseas Development Administration ODB Old Dirty Bastard ODB Online DataBase ODC Optical Disc Corporation ODC Optical Disk Cartridge ODC Order of Discalced Carmelites ODC Other Direct Costs ODC Ozone Destroying Chemical ODD Office of Due Diligence ODD Operator Distance Dialing ODD Oppositional Defiant Disorder ODD Optical Disc Drive ODE Object Database and Environment ODE Ordinary Differential Equation ODF Offshore Dynamic Fund ODF Open Document Format ODF Ordering & Distribution Facility ODG Object Developers Group ODH Ohio Department of Health ODI Object Definition Include [file] ODI Open Datalink Interface ODI Optical Digital Image ODI Overseas Development Institute ODI Overseas Direct Investment ODK Object Discovery Kit ODL Object Definition Language ODL Object Description Language ODL On-Demand Layer [Addition] ODL Open and Distance Learning ODM Object Data Manager ODM Operating Data Manuals ODM Organizational Domain Modeling ODM Original Design Manufacturer ODM Original Device Manufacturer ODN Optical Data Network ODO One Dog's Opinion ODP Ocean Drilling Program ODP Open Directory Project ODP Open Distributed Processing ODP Outline Development Plan ODQ Other Dueling Questions ODR Octal Data Rates ODR One Definition Rule ODR Ones Density Rule ODR Online Dispute Resolution ODR Optical Data Recognition ODR Optimized Dynamic Routing ODS Online Diagnostic System ODS Open Data Services ODS Open Domain Server ODS OpenServer Development System ODS OpenStack Design Summit ODS Operational Data Store ODS Overhead Data Stream ODS Ozone-Depleting Substances ODT Online Debugging Technique ODT [Microsoft] Office Developer Tools ODU Optical Density Unit ODV Overspeed and Drain Valve ODW [IBM] On Demand Workplace ODX Old Dominion X-Press ODY Office of Dineh Youth ODZ Operational Defense Zone OEA Old Etonian Association OEA Oxford English Academy OEA [PPC] Operating Environment Architecture OEB Open E-Book Standard OEB Operations Engineering Bulletin OEC Operational Evaluation Command OEC Organisation Entity Code OEC Other Exchange Company OED Oxford English Dictionary OEE Operating Equipment Efficiency OEE Overall Equipment Effectiveness OEF Operation Enduring Freedom OEF Operational Efficiency Factor OEG Operational Exposure Guide OEH One-Electron Hamiltonian OEI One Engine Inoperative OEI Operational Engineering Instruction OEJ One Eyed Jack OEL Organic Film Electro-Luminescent OEL Organizational Equipment List OEM Office of Emergency Management OEM Official Equipped Manufacturer OEM Original Equipment Manufacturer [Intel/Microsoft reseller] OEN Original Equipment Number OEO Office of Economic Opportunity OEP Office of Economic Preparedness OEP Open Experimental Platform OEQ Organizational Effectiveness Questionnaire OER Office of Environmental Restoration OES Office of Earthquake Studies OES Open Enterprise Services OES Open Enterprise Systems [Company Limited] OES Optical Emission Spectroscopy OES Orbital Eunuchs Sniper OES Order of the Eastern Star OES [Novell] Open Enterprise Server OET Office of Economic Transition OEU Operation Eyesight Universal OEU Operational Evaluation Unit OEU Overhead Electronics Units OEV Occupational Exposure Values OEW Offensive Electronic Warfare OEW Operational Empty Weight OEX Ocean EXplorer OEY Office of Employment and Youth OFA Obama For America OFA Office of Fiscal Administration OFA Open Fabrics Alliance OFA Organizing For Action OFB Office of Foreign Buildings OFB Open For Business OFB Output FeedBack OFC Optical Fiber Conference OFC Oxygen-Free Copper OFD One-Function Diagram OFD Open File Description OFE Order For Engagement OFF Object File Format OFG Opportunity For Growth OFH Oh Fucking Hell OFI Office of Financial Institutions OFJ Our Family Journal OFK Operation FitKids OFL Open Font License OFM Order of Friars Minor OFM Organisational Field Maintenance OFN Oregon Flora Newsletter OFO Oregon Field Ornithologists OFP Office of Fair Practice OFP Operational Flight Programme OFR Office of Federal Register OFR Old FRench OFR On-Field Review OFS Object FileSystem OFS Open File Server OFS Orange Free States OFS Order of Free State OFT Operational Flight Trainer OFT [UK] Office of Fair Trading OFU Optical Fiber Unit OFV Old Filtering Value OFV OutFlow Value OFV OverFlow Valve OFW Oh Fucking Well OFX Open Financial eXchange OFY Opportunities For Youth OFZ Obstacle Free Zone OGA One Generation Ahead OGA Other Government Agency OGA [Microsoft] Office Genuine Advantage OGB Oil and Gas Board OGB OpenSolaris Governing Board OGC Office of the General Counsel OGC Open GIS Consortium OGC [UK] Office of Government Commerce OGD Operator Group Delft OGD Overhead Garage Door OGE Office of Government Ethics OGE Operating Ground Equipment OGF Open Gaming Foundation OGF Open Grid Forum OGF Overseas Growth Fund OGG Order of the Georges and Georgettes OGH [CDC] Office of Global Health OGI Oregon Graduate Institute OGJ Oil & Gas Journal OGL Open General License OGL Overall Grade Level OGM Out-Going Message OGN On the Ground News OGN Online Gaming Network OGO Officer Grade Objectives OGP Office of Global Partnerships OGP Office of Global Programs OGP Open Graphics Project OGP Open Grid Protocol OGR Office of Geologic Repositories OGR Optimal Golomb Ruler OGS Operator-to-General Support OGT OutGoing Trunk OGU Osaka Gakuin University OGV Oak Glen Varsity OGV Outlet Guide Vane OGW Office of Ground Water OGX OutGoing eXchange OGY Ott, Grebogi, and Yorke OGZ Orthogonal Gelfand-Zetlin OHA Open Handset Alliance OHA Operating Hazard Analysis OHA Overseas Housing Allowance OHB Orleans HomeBuilders OHC Ocean Heat Content OHC OverHead Camshaft OHD Office of Hydrologic Development OHE Office of Hanford Environment OHF OverHead Fire OHG Old High German OHH Occupational Health and Hygiene OHI Oily House Index OHI Omega Healthcare Investors OHI Organisational Health Index OHI OverHaul Instruction OHJ Online Help Journal OHL Ontario Hockey League OHM Observe, Hack, Make OHM Office of Hazardous Materials OHM Open Hardware Manufacturing OHN Operation Healthy Neighborhoods OHO Oduduwa Heritage Organization OHP OverHead Projection OHQ Oregon Historical Quarterly OHR Operational Hazard Report OHS Office of Highway Safety OHS Open Hyperdocument System OHT Overhead Hoist Transport OHT OverHead Transmission tower OHU Occupational Health Unit OHU Ocean Heat Uptake OHU OverHead Unit OHV OverHead Valve OHV OverHead Vehicle OHW Oral History Workshop OHY Order of Hsu Yun OIA Office of International Activities OIA Open Information Access OIB Ocean Island Basalt OIC Office of Insurance Commission OIC Official Information Commission OIC Oh, I see [!] OIC Organisation of Islamic Conference OID Object IDentifier OID Outline Installation Drawing OIF Open Insulin Foundation OIF Optical Internetworking Forum OIF Osteogenesis Imperfecta Foundation OIG Office of the Inspector General OIH Ohio Industries for the Handicapped OII Occupational Injury or Illness OIL Object Implementation Language OIL Obsolete Item Lists OIL OpenStack Interoperability Lab OIL Operator Identification Language OIM Office of Industrial Mobilization OIM Open Information Model OIM Operator Initialization Manual OIM OSI Internet Management OIN Online Investor Network OIN Open Invention Network OIN Oracle Information Navigator OIO Obligated Involuntary Officer OIO Opportunities In Options OIP Office of Industrial Programs OIP Office of Information Policy OIP Operational Improvement Program OIP Osdorp Internet Posse OIR Office of Instructional Resources OIR Online Insertion and Removal OIR Operation Inherent Resolve OIR Other Information Requirements OIS Objective Instrumentation System OIS Office Information System OIS Open Interface Specification OIS Operations Information System OIS Organization for Internet Safety OIS Overnight Indexed Swap OIT Office of Information Technology OIT Oil Inlet Temperature OIT Oxidation Induction Time OIU Office Interface Unit OIU Operator Interface Unit OIU Orientation/Introduction Unit OIW Open Information Warehouse OIX Oregon Internet eXchange OIY Out In York OJA Office of Justice Assistance OJB ObJect-Relational Bridge OJB Online Journal of Bioinformatics OJC Operation Just Cause OJD Oregon Judicial Department OJE On-the-Job Evaluator OJF Ontario Job Futures OJG Operation Joint Guard OJH Open Junior High [School] OJI On-the-John Interruption OJI Open JVM Integration OJJ Office of Juvenile Justice OJM Oregon Jewish Museum OJN Ohio Job Net OJP Office of Justice Programs OJP On the Job Performance OJR On the Job Review OJS Organization Jointly Shared OJT On the Job Training OJU Oceania Judo Union OJW Oaktown Jazz Workshops OKA Ontario Kinesiology Association OKC Ottawa Kennel Club OKD Open Knowledge Definition OKD Our Kind, Dear OKE Open Kernel Environment OKE Optical Kerr Effect OKF Okinawan Karate Federation OKG Ornithine alpha-Keto-Glutarate OKI Open Knowledge Initiative OKJ Old King James OKK Oxfordshire Kadet Karting OKM Organizing for Knowledge Management OKP OpenServer Kernel Personality OKQ One Key Question OKR Objectives and Key Results OKR Open Knowledge Resource OKS Ontopia Knowledge Suite OKU OKlahoma University OKY Organization of Kurdish Youth OKZ Omega Kappa Zeta OLA Obligatory List Article OLA Optical Laboratories Association OLB OnLine Banking OLB OnLine Bible OLB Outer Lead Bond OLB Outside Line Backer OLC Oak Leaf Cluster OLC Office of Legal Counsel OLC On-line Learning Center OLD Operating Level Days OLE [Microsoft] Object Linking & Embedding OLF Over-Land Flow OLG Our Lady of Grace [School] OLH Oriental LongHair OLI Operational Land Imager OLI Originating Line Information OLI OSI Library Interface OLJ Optimum Learning Japanese OLL OnLine Library OLM O'odua Liberation Movement OLM Object Location Manager OLM OnLine Monitor OLM Operational Loads Measurement OLM Operator Lifecycle Manager OLN Oracle Learning Network OLN Outdoor Life Network OLO OnLine Opinion OLO Optical Local Oscillator OLO Other Local Operator OLP Object Link Provider OLP On-Line Printer OLP On-Line Provisioning OLQ Organizational Leadership and Quality OLR OffLine Reader OLR Outgoing Longwave Radiation OLS Online Library System OLS Open Learning Support OLS Operation Lifeline Sudan OLS Operational Level Support OLS Ottawa Linux Showcase OLS Ottawa Linux Symposium OLS [Manx] Overseas Labour Scheme OLT On-Line Testing OLT Orbital Launch Tower OLU Organization of Lukumi Unity OLV Ordinary LeaVe OLW On-Line World OLW Operational Landing Weight OLX Off-Line eXpress OLY Oregon Lutheran Youth OLZ Old Level Zero OMA Open Mobile Alliance OMA Operations and Maintenance, Army OMA Optical Multichannel Analyzer OMA Organisational Maintenance Activity OMA [OMG] Object Management Architecture OMB Orange Man Bad OMB [USA] Office of Management and Budget OMC Oh My Clawed OMC Operations & Maintenance Centre OMC Otara Millionaire's Club OMD Orchestral Maneuvers in the Dark OMD Original Manufacturer Data OME Open Messaging Environment OME Operating Mass Empty OME Operational Mission Environment OME Order Management Engine OME Oregon Microcomputer Engineering OME Original Measurement Error OMF Officer Master File OMF Offshoring Management Framework OMG Object Management Group OMG Oh My God OMG Outlaw Motorcycle Gang OMH Office of Minority Health OMI Office of Medical Investigations OMI Oklahoma Marriage Initiative OMI OpenCAPI Memory Interface OMI Operation and Maintenance Instruction [manual] OMI Ozone Monitoring Instrument OMJ Open Mind Journals OMM Operation and Maintenance Manual OMM Output Message Manual OMN Operations and Maintenance, Navy OMP Operation and Maintenance Phase OMR Operational Management Review OMR Optical Mark Recognition OMS Object Management System OMS Office of the Martyr Sadr OMS Onboard Maintenance System OMS Open Missions Systems OMS Open Music System OMS Optical Mass Spectroscopy OMS Orbital Maneuvering System OMS Order Management System OMT Object Modeling Technique OMT Onboard Maintenance Terminal OMT Outbreak Management Team OMU One-Man Unix OMU Owensboro Municipal Utilities OMV Office of Motor Vehicles OMV Orbital Maneuvering Vehicle OMW Ocean Monitoring Workstation OMW On My Way OMX Ohio Material eXchange OMY Online Muslim Youth OMZ Oxygen Minimization Zone ONA Open Network Architecture ONA Operator New Anonymous ONA Overseas National Airways ONB Orienteering New Brunswick ONC Open Network Computing ONC Ordinary National Certificate OND Operational Need Data OND Ordinary National Diploma ONE Other Network Entities ONE [SUN] Open Net Environment ONF Olympic National Forest ONG Ohio National Guard ONH Optic Nerve Hypoplasia ONI Oceanic Nino Index ONI Office of Naval Intelligence ONI OpenNet Initiative ONI Operator Number Identification ONL Organization Net List ONM Open Network Management ONN Ohio News Network ONN Oldest Not Needed ONO Or Nearest Offer ONP Open Network Provision ONP Optical Nuclear Polarization ONR Office of Naval Research ONS Office for [UK] National Statistics ONS Operational Need Statement ONU Optical Network Unit ONV OpenDaylight Network Visualization ONV Optics for Night Vision ONW OverNight Ward ONX Open Node syntaX ONY Organisation of Native Youth OOA Object-Oriented Analysis OOA Out Of Air OOA Out Of Area OOB Offensive Operations Branch OOB Out-Of-Band [data] OOC Ohio Organizing Collaborative OOC Out Of Character OOD Object-Oriented Design OOD Officer Of the Deck OOE Object Oriented Engineering OOE Out-of-Order [instruction] Execution OOF Object-Oriented Finite element OOF Object-Oriented Forth OOF Object-Oriented Fortran OOF Office Of Finance OOF Office Of the Future OOF Out Of Food OOF Out Of Frame OOF Out-Of-Focus OOF Outrage Object Format OOG Object Orientation Game OOG Ocean Outfall Group OOG Office Of the Government OOG Old Order Group OOG Out Of Game OOG Out Of Gauge OOH Object Oriented HTML OOH Occupational Outlook Handbook OOH Out Of Hemisphere OOH Out Of Hours OOI Object-Oriented Interoperability OOI Out Of Interest OOJ Order Of Johns OOK On-Off Key OOL Object-Oriented Language OOL Open Objects Library OOL Out Of Limits OOM Object-Oriented Middleware OOM Orders Of Magnitude OOM Out Of Memory OOM Outside Office Memo OON Out Of Network OOO Out Of Office OOO Out-Of-Order [instruction execution] OOP Object-Oriented Programming OOP Out Of Plant OOP Out Of Production OOR Object-Oriented Requirements OOS Only One Shot OOS Out-Of-Service OOT Object-Oriented Technology OOT Out Of Time OOT Out Of Town OOU Out Of Use OOV Out Of View OOV Out-Of-Vocabulary OOW Officer Of the Watch OOY Office On Youth OPA Ocean Park Advisors OPA Office of Public Affairs OPA Ontario Podiatry Association OPA Oral Pharyngeal Airway OPA Outer Planets Alliance OPB Office of Plans and Budget OPC Ocean Products Center OPC Operations Per Cycle OPC Optical Particle Counter OPC Optical Proximity Correction OPC Optimum Power Control OPC Originating Point Codes OPC Other People's Code OPC Overall Planning Chart OPD Officer Personnel Directorate OPD Officer Professional Development OPD One Per Desk OPE Operational Proficiency Examination OPF Object Persistence Framework OPF Open Packaging Format OPF Orbiter Processing Facility OPG Online Policy Group OPG Optical Parametric Generator OPH Orders Per Hour OPI Office of Planning and Integration OPI Optional Procedure Indicator OPJ Orthogonal Persistence for Java OPK OEM Pre-installation Kit OPL Obvious Panty Line OPL Open Publication License OPM Office of Personnel Management OPM Operational Performance Management OPM Other People's Money OPM Outside Plant Module OPN Odd Perfect Number OPN Open Projects Net OPN Optional Part Number OPN Other Procurement, Navy OPO Optical Parametric Oscillator OPP Office of Planetary Protection OPP Oracle Partner Program OPP Other People's Penis OPP Other People's Problem OPR Office of Primary Responsibility OPR Office of Professional Responsibility OPR Official Pattern Release OPR Once Per Revolution OPR Outstanding Price Record OPS Off-Premises Station OPS Office of Personnel Systems OPS Office of the Permanent Secretary OPS Online Presentation Service OPS Open Publication Structure OPS Operations Per Second OPS Optical Packet Switching OPS Oracle Parallel Server OPS Oriental Princess Society OPT Open Protocol Technology OPT Optional Practical Training OPU Oregon Parents United OPU Overspeed Protection Unit OPV Offshore Patrol Vessel OPV Oral Polio Vaccine OPV OverPressure Valve OPW Objective Personal Weapon OPW Ohio Pattern Works OPW Opportunities & Products Warehouse OPW Orthogonalized Plane Wave OPW Outreach Program for Women OPX Off-Premises eXtension OPX OPerational eXcellence OPY Out and Proud Youth OPZ Optimal Performance Zone OQL Object Query Language ORA O'Reilly & Associates ORA Optimum Repair Analysis ORB Object Request Broker ORB Office Repeater Bay ORB OPEC Reference Basket ORC On Request Compilation ORC [SGI] Open Research Compiler ORD Operational Requirements Document ORD Optical Rotatory Dispersion ORE OPerational Readiness Evaluation ORF Open Reading Frame ORG Open Rights Group ORG Operational Requirements Group ORI Office of Research Integrity ORI Operational Requirement Indicator ORL OR-Logical ORL Outstanding Request List ORM Object-Relational Mapper ORM Operational Risk Management ORM Optical Remote Module ORN Originator's Reference Number ORP Office Relocation Project ORP Open Runtime Platform ORP Overhead Recovery Pool ORR Overhaul Replacement Rate ORS Occurrence Reporting System ORS Operations Reporting System ORS Oral Rehydration Solution ORT Ongoing Reliability Test ORT Operational Readiness Test ORT OSS Review Toolkit ORU Orbital Replacement Unit OSA Obstructive Sleep Apnoea OSA Open Scripting Architecture OSA Open Service Access OSA Open Solutions Alliance OSA Open Source Analysis OSA Operational System Administrator OSA Outfitting Supply Activity OSA [USA] Office of the Secretary of the Army OSB Operational Security Baseline OSB Operations Stations Book OSB Order of St. Benedict OSC Object Size Checking OSC Object Storage Client OSC Office of Special Counsel OSC One Stop Centre OSC Online Support Center OSC Ontario Securities Commission OSC Open Science Collaboration OSC Open Sound Control OSC Open Source Community OSC OpenSystems Center OSC Operator Services Center OSC Orbital Sciences Corporation OSC Orson Scott Card OSD Object-Based Storage Device OSD Office of the Secretary of Defense OSD On-Screen Display OSD One Shot Down OSD Open Software Distribution OSD Open Source Definition OSD Open Source Developers OSD Operational Stand Down OSE Open Software Environment OSE Operational Support Equipment OSE Oslo Stock Exchange OSF Open Science Framework OSF Open Society Foundation OSF Open Software Foundation OSF Oppose SUN Forever OSF Order of St. Francis OSG Operation Support Group OSG Organo Silicate Glass OSG OverSpeed Generator OSH Operator's SHell OSI On-Site Inspection OSI Ontario Swine Improvement OSI Open Society Institute OSI Open Systems Interconnection OSI Open-Source Initiative OSI Operating Space Item OSI Operational Support Instruction OSI Operational Support Inventory OSI Other Supplemental Information OSI Oxford Systems Integration OSL Open Source Laboratory OSL Open Source License OSM Office of Surface Mining OSM On-Site Maintenance OSM Open Source Matters OSM Open Source Media OSM Open Space Movement OSM Open Street Map OSM Operations Sequence Model OSM Optical Service Module OSN Office Systems Node OSN Online Social Network OSN Open Source News OSN Open Systems Network OSO OpenStack Operator OSO Originating Signaling Office OSO Overseas Support Operation OSO [SUN] Open Source Office OSP Office of Special Plans OSP Open Services Platform OSP Open Source Portfolio [Initiative] OSP Operating System Protected [domain] OSP Optical Storage Processor OSP Orbital Space Plane OSP Oregon State Police OSP OutSide Plant OSP [Microsoft] Open Specification Promise OSR Occupation Survey Report OSR Operating System Recreation [Project] OSR Orthogonal Spatial Regression OSR [Microsoft Windows] OEM Service [OS] Release OSS Object Services Standard OSS Office Support System OSS Open Sound System OSS Open Source Software OSS Operational Support System OSS Operator Service System OSS [USA] Office of Strategic Services [later CIA] OST Object Storage Target OST Open Source Technology OST Open Source Telecom OST Open Space Technology OST Open Standards Terminal OST Order Ship Time OSU Oklahoma State University OSU Oregon State University OSU Outboard Station Unit OSV Open Source Victoria OSV Open-Source Versatile OSV Operating System Vendor OSX Operating System 10 [!] OTA Oil sump Temperature APU OTA Online Travel Agency OTA Open Technology Assembly OTA Open Test Alliance OTA Over The Air OTA [HST] Optical Telescope Assembly OTA [USA] Office of Technology Assessment OTB Off-Track Betting OTB Outstanding Trace Buffer OTC One Time Charge OTC Operational Test Centre OTC Operator Training Course OTC Output Technology Corporation OTC Over The Counter OTD Observed Time Difference OTD Ornithine Transcarbamylase Deficiency OTD Orthogonal Transmit Diversity OTD [Microsoft] Outlook-Transmitted Disease OTE Opinion Target Extraction OTF On Top Fix OTF Open Telematics Framework OTF Open Token Foundation OTG [USB] On-The-Go OTH Over The Horizon OTI Object Technology International OTL Out To Lunch OTM Object Transaction Monitor OTM On The Make OTM On Time Marker OTM Optional Teaching Method OTN Oracle Technology Network OTP Omega Translation Process OTP On The Phone OTP On-line Transaction Processing OTP One Time Pad OTP One Time Password [Authentication] OTP Operation Test Piece OTP Operational Test Programme OTP Opposite Track Path OTR Off The Record OTR Old Time Radio OTR On The Rag OTR Opening Token Right OTR Operational Turn Round OTR Operations Trouble Report OTS Object Transaction Service OTS Ocean Thermal System OTS Off The Shelf OTS Office of Thrift Supervision OTS Officer Training School OTS Open Tax Solver OTS Open Text Summarizer OTS Out To Score OTS Overhaul Test Schedule OTT Object Type Translator OTT Over The Top OTV Orbital Transfer Vehicle OTX Online Testing eXchange OUD Over-engineered Ueber-specified Development OUF Optimal Unrolling Factor OUI Organizationally Unique Identifier OUM Ovonics Unified Memory OVA Open Virtual Appliance OVC Office for Victims of Crime OVC Offset-Value Coding OVC OTOP Village Champion OVC [Hewlett-Packard] OpenView Communications OVD Online Video Distributor OVF Open Virtualization Format OVF Open Voting Foundation OVP Office of the [USA] Vice President OVP Outflow Valve Position OVP OverVoltage Protection OVS Oracle Video Server OWA Outlook Web Access OWC Oil Water Contact OWC [Microsoft] Office Web Components OWE Open Water Effect OWG Ordinary White Guy OWI Operating While Intoxicated OWL OpenWall Linux OWL OverWhelmingly Large [Telescope] OWO Oral WithOut OWS Optional White Space OXC Optical CrossConnect [!] OXP [Microsoft] Office XP OYC Out Year Costs OYM O'odua Youth Movement