| Acronym | Sense | Language | Topics |
|---|---|---|---|
| NCOS | National Commission On Space | In English | → Astronomy → Astronautics |
| ND | NASA Document | In English | → Astronomy → Astronautics → United States |
| NDGPS | Nationwide Differential Global Positioning System | In English | → Geodesy, cartography → Astronautics → Telecommunications |
| NEACP | National Emergency Airborne Command Post | In English | → Military engineering → Aeronautics, aircraft |
| NEEDS | NASA End-To-End Data System | In English | → Data → Astronomy → Astronautics → United States |
| NEMS | NASA Equipment Management System | In English | → Maintenance and logistics → Astronautics → United States |
| NERVA | Nuclear Engine for Rocket Vehicle Application | In English | → Nuclear technology → Astronautics |
| NESDIS | National Environmental Satellite Data and Information Service | In English | → Environmental protection → Astronautics |
| NESP | Naval Extremely high frequency Satellite Program | In English | → Military engineering → Astronautics |
| NESS | National Environmental Satellite Service | In English | → Threats to the environment → Astronautics |
| NET | NASA Employee Team | In English | → Astronautics → United States |
| NEVS | NASA Equipment Visibility System | In English | → Astronautics → United States |
| NFS | NASA FAR Supplement | In English | → Astronautics → United States |
| NGA | National Geospatial-Intelligence Agency | In English | → Central administration → Astronautics |
| NGT | NASA Ground Terminal | In English | → Astronautics → United States |
| NHB | NASA Handbook | In English | → Astronautics → United States |
| NIFO | Neidentigita Fluganta Objekto = OVNI | Objet Volant Non Identifié | In French = OVNI | Objecte Volador No Identificat | In Catalan = НЛО | Неидентифициран летящ обект | In Bulgarian = OVNI | Objeto Volador No Identificado | In Spanish = UFO | Unidentifiziertes Flugobjekt | In German = UFO | Unidentified Flying Object | In English = UFO | Unknown Flying Object | In English = UFO | Uidentificeret flyvende objekt | In Danish = UFO | Unbekend fleanend objekt | In Frisian = עב"מ | עצם בלתי מזוהה | In Hebrew = OVNI | Oggetto Volante Non Identificato | In Italian = NLO | Neidentificēts lidojošs objekts | In Latvian = UFO | Uidentifisert flygende objekt | In Norwegian = UFO | Uidentifisert flygande objekt | In Nynorsk = NOL | Niezidentyfikowany Obiekt Latający | In Polish = OVNI | Objeto Voador Não Identificado | In Portuguese = OZN | Obiect Zburător Neidentificat | In Romanian = НЛО | Неопознанный летающий объект | In Russian = NLO | Neidentifikovani leteći objekat | In Serbo-Croatian |
In Esperanto | → Astronautics |
| NLG | Nose Landing Gear | In English | → Aeronautics, aircraft |
| NLGD | Nose Landing Gear Door | In English | → Aeronautics, aircraft |
| NLO | Neidentificēts lidojošs objekts = NIFO, OVNI, НЛО, UFO, עב"מ, NOL, OZN (look above) |
In Latvian | → Astronautics |
| NLO | Neidentifikovani leteći objekat = NIFO, OVNI, НЛО, UFO, עב"מ, NOL, OZN (look above) |
In Serbo-Croatian | → Astronautics |
| NLR | Nationaal Lucht- en Ruimtevaartlaboratorium | In Dutch | → Research institutes → Aeronautics, aircraft → Astronautics |
| NMI | NASA Management Instruction | In English | → Management → Astronautics → United States |
| NOES | National Operational Environmental Satellite | In English | → Threats to the environment → Astronautics |
| NOL | Niezidentyfikowany Obiekt Latający = NIFO, OVNI, НЛО, UFO, עב"מ, NLO, OZN (look above) |
In Polish | → Astronautics |
| NOPAR | Nonorbiter Parts Authorization Request | In English | → Astronautics |
| NORAD | North American Aerospace Defense Command | In English | → Military engineering → Aeronautics, aircraft → Astronautics |
| NORAD | North American Air Defense Command | In English | → 358 → Military engineering → Aeronautics, aircraft |
| NOSS | National Oceanic Satellite System | In English | → Marine research, oceanography → Astronautics |
| NPC | NASA Procurement Circular | In English | → Astronautics → United States |
| NPC | NASA Publication Control | In English | → Astronautics → United States |
| NPD | NASA Policy Directive | In English | → Management → Astronautics → United States |
| NPN | NASA Part Number | In English | → Astronautics → United States |
| NPS | NASA Planning Studies | In English | → Astronautics → United States |
| NPS | Nonpropulsive Stage | In English | → Astronautics |
| NPSS | NASA Packet Switching System | In English | → Telecommunications → Astronautics |
| NRA&A | Nouvelle Revue d'Aéronautique et d'Astronautique | In French | → Serial publications, periodicals → Aeronautics, aircraft → Astronautics |
| NRALT | NASA Radar Altimeter | In English | → Geodesy, cartography → Astronautics → United States |
| NRDS | Nuclear Rocket Development Station | In English | → Nuclear technology → Astronautics |
| NS | Nuclear Shuttle | In English | → Nuclear technology → Astronautics |
| NSC | NASA Standard Computer | In English | → Computer hardware → Astronautics → United States |
| NSD | NASA Standard Detonator | In English | → Astronautics → United States |
| NSI | NASA Science Internet | In English | → Internet → Astronautics → Astronomy → United States |
| NSI | NASA Standard Initiator | In English | → Astronautics → United States |
| NSIF | Near-Space Instrumentation Facility | In English | → Astronomy → Astronautics |
| NSLD | NASA Shuttle Logistics Depot | In English | → Maintenance and logistics → Astronautics → United States |
| NSO | NASA Support Operation | In English | → Astronautics → United States |
| NSP | NASA Support Plan | In English | → Astronautics → United States |
| NSTI | NASA Simulation Traffic Interface | In English | → Computer simulation → Astronautics → United States |
| NSTL | National Space Technology Laboratories | In English | → Research institutes → Astronomy → Astronautics |
| NSTS | National Space Transportation System | In English | → Astronautics |
| NTD | NASA Test Director | In English | → Astronautics → United States |
| NTS | Navigation Technology Satellite | In English | → Astronautics |
| NTS | Nonavionics Test Station | In English | → Aeronautics, aircraft |
| NTSO | NASA Test Support Office | In English | → Astronautics → United States |
| NUAAJ | Nanjing University Aeronautics and Astronautics Journal | In English | → Serial publications, periodicals → Higher education, universities → Aeronautics, aircraft → Astronautics → China |
| NuSTAR | Nuclear Spectroscopic Telescope Array | In English | → Astronautics → Astronomy |
| NV | NASA Altimeter Verification | In English | → Astronautics → United States |
| NVAFB | North Vandenberg Air Force Base | In English | → 358 → Aeronautics, aircraft → United States |
| NVAV | Nederlandse Vereniging van Amateur Vliegtuigbouwers (www.nvav.nl) | In Dutch | → Organizations and associations → Aeronautics, aircraft → Netherlands |
| NVR | NASA Waiver | In English | → Astronautics → United States |
| OAA | Orbiter Access Arm | In English | → Astronautics |
| OAA | Orbiter Alternate Airfield | In English | → Astronautics |
| OAC | Orbital Activation and Checkout | In English | → Astronautics |
| OAFD | Orbiter Aft Flight Deck | In English | → Astronautics |
| OAFTO | Orbiter Atmospheric Flight Test Office | In English | → Aeronautics, aircraft → Astronautics |
| OAHTS | Orbiter Avionics Hardware Tracking System | In English | → Software → Computer hardware → Aeronautics, aircraft |
| OALC | Ogden Air Logistics Center | In English | → Maintenance and logistics → Aeronautics, aircraft |
| OAME | Orbital Attitude and Maneuvering Electronics | In English | → Electronics → Astronautics |
| OAMP | Optical Airborne Measurements Program | In English | → Aeronautics, aircraft |
| OAMP | Optical Aircraft Measurements Program | In English | → Aeronautics, aircraft |
| OAMS | Orbital Attitude and Maneuvering System | In English | → Astronautics |
| OAO | Orbital Astronomical Observatory | In English | → Observatories → Astronautics |
| OARE | Orbital Acceleration Research Experiment | In English | → Astronomy → Astronautics |
| OARS | Orbiter Avionics Radiation Specification | In English | → Aeronautics, aircraft → Astronautics |
| OAS | Orbiter Aeroflight Simulator | In English | → Aeronautics, aircraft → Astronautics |
| OAS | Orbiter Atmospheric Simulator | In English | → Aeronautics, aircraft → Astronautics |
| OAS | Orbiter Avionics Simulator | In English | → Aeronautics, aircraft → Astronautics |
| OAS | Orbiter Avionics System | In English | → Aeronautics, aircraft → Astronautics |
| OASCB | Orbiter Avionics Software Control Board | In English | → Software → Aeronautics, aircraft → Astronautics |
| OASIS | Orbit Avionics Software Integration Study | In English | → Software → Aeronautics, aircraft |
| OASM | Office of Aerospace Medicine | In English | → Medicine → Aeronautics, aircraft → Astronautics |
| OAST | Office of Aeronautics and Space Technology | In English | → Aeronautics, aircraft → Astronautics |
| OATS | Orbiter Avionics Tracking System | In English | → Aeronautics, aircraft → Astronautics |
| OCA | Orbiter Capability Analysis | In English | → Astronautics |
| OCA | Orbiter Capability Assessment | In English | → Astronautics |
| OCAC | Orbiter Cabin Air Cleaner | In English | → Astronautics |
| OCALC | Oklahoma City Air Logistics Center | In English | → Maintenance and logistics → Aeronautics, aircraft → United States |
| OCCP | Orbit Command Computer Program | In English | → Computer programs → Astronautics |
| OCDR | Orbiter Critical Design Review | In English | → Astronautics |
| OCF | Orbiter Computational Facilities | In English | → Computer hardware → Astronautics |
| OCH | Orbiter Common Hardware | In English | → Computer hardware → Astronautics |
| OCTW | Optical Communications Through the shuttle Window | In English | → Astronautics |
| ODF | Orbit Determination Facility | In English | → Astronomy → Astronautics |
| ODIN | Orbital Design Integration System | In English | → Astronautics |
| ODM | Orbiter Disconnect Mechanism | In English | → Astronautics |
| ODRC | Orbiter Data Reduction Center | In English | → Data → Astronautics |
| OEAS | Orbital Emergency Arresting System | In English | → Astronautics |
| OECS | Orbital Express Capture System | In English | → Astronautics |
| OES | Orbiter Emergency Site | In English | → Astronautics |
| OET | Orbiter Engineering and Test | In English | → Astronautics |
| OEX | Orbiter Experiment | In English | → Astronautics |
| OF | Orbital Flight | In English | → Astronautics |
| OFDS | Orbiter Flight Dynamic Simulator | In English | → Computer simulation → Astronautics |
| OFEMA | Office Français d'Exportation de Matériels Aéronautiques | In French | → Trade → Military engineering → Aeronautics, aircraft |
| OFI | Operational Flight Instrumentation | In English | → Aeronautics, aircraft → Astronautics |
| OFK | Optical Flight Kit | In English | → Aeronautics, aircraft → Astronautics |
| OFP | Operational Flight Profile | In English | → Aeronautics, aircraft → Astronautics |
| OFP | Operational Flight Program | In English | → Aeronautics, aircraft → Astronautics |
| OFP | Orbiter Flight Program | In English | → Astronautics |
| OFS | Orbital/Orbital Flight System | In English | → Astronautics |
| OFS | Orbiter Flight Simulator | In English | → Astronautics |
| OFS | Orbiter Functional Simulator | In English | → Astronautics |
| OFT | Operational Flight Test | In English | → Aeronautics, aircraft → Astronautics |
| OFT | Orbital Flight Test | In English | → Quality management → Astronautics |
| OFT | Orbital Flight Training | In English | → Education → Astronautics |
| OFTDS | Orbital Flight Test Data System | In English | → Data → Astronautics |
| OGA | Outer Gimbal Angle | In English | → Astronautics |
| OGA | Outer Gimbal Axis | In English | → Astronautics |
| OGMT | Orbiter Greenwich Mean Time | In English | → Standardization → Astronautics |
| OHA | Orbital Height Adjustment Maneuver | In English | → Astronautics |
| OHGVT | Orbital Horizontal Ground Vibration Test | In English | → Astronautics |
| OI | Orbiter Insertion | In English | → Astronautics |
| OI | Orbiter Instrumentation | In English | → Astronautics |
| OIA | Orbiter Interface Adapter | In English | → Human-computer interaction → Astronautics |
| OIC | Orbital Integrated Checkout | In English | → Astronautics |
| OIE | Orbiter Integration Engineering | In English | → Astronautics |
| OIS | Orbit Injection Subsystem | In English | → Astronautics |
| OIS | Orbit Inserting System | In English | → Astronautics |
| OIS | Orbit Insertion Subsystem | In English | → Astronautics |
| OIS | Orbiter Instrumentation Systems | In English | → Astronautics |
| OISTP | Oxygen-Iodine Supersonic Technology Program | In English | → Aeronautics, aircraft |
| OIT | Orbiter Integrated Test | In English | → Astronautics |
| OIT | Orbiter Integration Test | In English | → Astronautics |
| OIT | Orbiter Interface Test | In English | → Human-computer interaction → Astronautics |
| OIVS | Orbiter Interface Verification Set | In English | → Human-computer interaction → Astronautics |
| OLERD | Orbiter Landing Emergency Rescue Data | In English | → Data → Astronautics |
| OLF | Orbiter Lifting Frame | In English | → Astronautics |
| OLIF | Orbiter Landing Instrumentation Facility | In English | → Astronautics |
| OLOW | Orbiter Lift-Off Weight | In English | → Astronautics |
| OLSP | Orbiter Logistics Support Plan | In English | → Astronautics |
| OMA | Orbiter Maintenance Area | In English | → Maintenance and logistics → Astronautics |
| OMBUU | Orbiter Midbody Umbilical Unit | In English | → Astronautics |
| OMCF | Orbiter Maintenance and Checkout Facility | In English | → Maintenance and logistics → Astronautics |
| OMDP | Orbiter Maintenance Down Period | In English | → Maintenance and logistics → Astronautics |
| OME | Orbital Maneuvering Engine | In English | → Astronautics |
| OME | Orbiter Main Engine | In English | → Astronautics |
| OMET | Orbiter Mission Elapsed Time | In English | → Astronautics |
| OMEWG | Orbiter Maintenance Engineering Working Group | In English | → Maintenance and logistics → Astronautics |
| OMK | Orbiter Mission Kit | In English | → Astronautics |
| OML | Orbiter Mold Line | In English | → Astronautics |
| 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 |
| OMV | Orbital Maneuvering Vehicle | In English | → Astronautics |
| ONBT | Orbiter Neutral Buoyancy Trainer | In English | → Astronautics |
| 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 |
| OOD | Orbiter On Dock | In English | → Astronautics |
| 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 |
| OPBS | Orbiter Payload Bay Simulator | In English | → Astronautics |
| OPF | Orbiter Processing Facility | In English | → Astronautics |
| OPI | Orbiter Payload Interrogator | In English | → Astronautics |
| OPIS | Orbiter Prime Item Specification | In English | → Astronautics |
| 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 |
| OPPAR | Orbiter Project Parts Authorization Request | In English | → Astronautics |
| OPR | Orbiter Payload Recorder | In English | → Astronautics |
| OPS | Orbiter Project Schedule | In English | → Astronautics |
| OPSS | Orbital Propellant Storage Subsystem | In English | → Astronautics |
| OPWS | Orbital Payload Work Station | In English | → Astronautics |
| ORCUS | Orbital Recording Capability and Update System | In English | → Astronautics |
| ORD | Orbital Requirements Document | In English | → Astronautics |
| 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 |
| 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 |
| OSC | Orbital Sciences Corporation | In English | → Astronautics |
| OSCAR | Orbiting Satellite Carrying Amateur Radio | In English | → Astronautics → Telecommunications |
| 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 |