| Acronym | Sense | Language | Topics |
|---|---|---|---|
| MSSTM | Military Space System Technology Model | In English | → Military engineering → Astronautics |
| MSSTP | Military Space Systems Technology Plan | In English | → Military engineering → Astronautics |
| MST | Mikrosystemtechnik | In German | → Mechanical engineering → Electronics |
| MST | Missile System Test | In English | → Military engineering |
| MSTec | Materials Science and Technology | In English | → Serial publications, periodicals → Materials science |
| MSV | Mission Support Vehicle | In English | → Vehicle engineering |
| MSVP | Master Shuttle Verification Plan | In English | → Astronautics |
| MSW | Municipal Solid Waste | In English | → Environmental technology, water supply, waste management |
| MSX | Midcourse Space Experiment | In English | → Astronautics → Astronomy |
| MT | Mission Trajectory | In English | → Astronautics |
| MT | Manufacturing Technology | In English | |
| MT | Moyenne Tension | In French | → Electrical engineering |
| MTB | Materials Testing Branch | In English | → Maintenance and logistics → Materials science |
| MTC | Manual Thrust Controller | In English | → Vehicle engineering |
| MTC | Manual Traffic Control | In English | → Vehicle engineering → Transport and postal services |
| MTC | Master Thrust Control(ler) | In English | → Vehicle engineering |
| MTCR | Missile Technology Control Regime | In English | → Military engineering |
| MTDM | Mechanics of Time-Dependent Materials | In English | → Serial publications, periodicals → Mechanical engineering |
| MTEE | Maintenance Test Equipment, Electrical | In English | → Maintenance and logistics → Electrical engineering |
| MTEM | Maintenance Test Equipment, Mechanical | In English | → Maintenance and logistics → Mechanical engineering |
| MTK | Mechanical Timekeeping | In English | → Mechanical engineering |
| MTK | Mechanized Timekeeping | In English | → Mechanical engineering |
| MTM | Mechanical Test Model | In English | → Mechanical engineering |
| MTOGW | Maximum Takeoff Gross Weight | In English | → Aeronautics, aircraft → Astronautics |
| MTOW | Maximum Takeoff Weight | In English | → Aeronautics, aircraft → Astronautics |
| MTP | Manufacturing Technical Procedure | In English | |
| MTPE | Mission To Planet Earth | In English | → Planets and satellites → Astronautics |
| MTPTC | Ministère des Travaux Publics, Transports et Communications | In French | → Central administration → Civil engineering → Civil engineering and land transport |
| MTS | Main Thruster Subsystem | In English | → Vehicle engineering |
| MTV | Mass Transfer Vehicle | In English | → Vehicle engineering |
| MTVC | Manual Thrust Vector Control | In English | → Vehicle engineering |
| MTW | Maximum Taxi Weight | In English | → Vehicle engineering |
| MUA | Maximum Usable Altitude | In English | → Aeronautics, aircraft → Astronautics |
| MŰI | Magyar Űrkutatási Iroda | In Hungarian | → Astronomy → Astronautics → Hungary |
| MUNEE | Municipal Networks for Energy Efficiency | In English | → Public administration, government → Energy economics |
| MUSIS | Multiuser Satellite Imagery System | In English | → Astronautics |
| MUST | Modélisation de l'Usage et de la Sécurité des Transports = MUST | Modelling the Use and Safety of Transport | In English |
In French | → Vehicle engineering → Transport and postal services |
| MUST | Modelling the Use and Safety of Transport = (look above) |
In English | → Accidents, risks, safety → Vehicle engineering → Transport and postal services |
| MV | Manufacturing Verification | In English | |
| MVF | Manned Vertical Flight | In English | → Aeronautics, aircraft → Astronautics |
| MVI | Microgravity Vestibular Investigation | In English | → Astronomy → Astronautics |
| MVM | Mariner Venus/Mercury | In English | → Astronomy → Astronautics |
| MVWT | Mated Vehicle Wind Tunnel | In English | → Vehicle engineering |
| MWN | Materials World Network | In English | → Organizations and associations → Materials science |
| MWS | Missile Weapon System | In English | → Military engineering |
| MWS | Missile Warning Set | In English | → Military engineering |
| MWV | Maximum Working Voltage | In English | → Electrical engineering |
| NAA | North American Aircraft | In English | → Aeronautics, aircraft → United States |
| NaAIJ | Nanjing Aeronautical Institute Journal | In English | → Serial publications, periodicals → Aeronautics, aircraft → China |
| NAC | Naval Avionics Center | In English | → Aeronautics, aircraft |
| NACA | National Advisory Committee for Aeronautics | In English | → Aeronautics, aircraft |
| NacEl | Nachrichten Elektronik | In German | → Serial publications, periodicals → Electronics |
| NACRE | Nouvelle Architecture de Calculs de REcharge | In French | → Nuclear technology |
| NADGE | NATO Air Defense Ground Environment | In English | → Military affairs → Military engineering |
| NADS | Norwegian Association for Defence Suppliers | In English | → Associations → Military engineering |
| NAEC | Naval Air Engineering Center | In English | → Aerodynamics → Aeronautics, aircraft |
| NAGINELS | Non Aggressive Glass Internal Engraving Laser System | In English | |
| NAM | National Association of Manufacturers | In English | → Associations |
| NAM | Nuclear Assessment Methodology | In English | → Nuclear technology |
| NAP | Navigation Analysis Program | In English | → Vehicle engineering → Transport and postal services |
| NAPE | Narodowa Agencja Poszanowania Energii | In Polish | → Energy economics |
| NAS | National Aircraft Standard | In English | → Standardization → Aeronautics, aircraft |
| NAS | National Airspace System | In English | → Aeronautics, aircraft → Astronautics |
| NAS | Naval Air Station | In English | → Public administration, government → Aeronautics, aircraft |
| NAS | Nonavionics Simulator | In English | → Computer simulation → Aeronautics, aircraft |
| NASA | National Aeronautics and Space Administration (www.nasa.gov) | In English | → Central administration → Astronomy → Aeronautics, aircraft → Astronautics → United States |
| NASAC | NASA Conference Publication | In English | → Serial publications, periodicals → Astronomy → Astronautics → United States |
| NASAL | NASA Circular Letter | In English | → Serial publications, periodicals → Astronomy → Astronautics → United States |
| NASAR | NASA Reference Publication | In English | → Serial publications, periodicals → Astronomy → Astronautics → United States |
| NASAS | NASA Special Publication | In English | → Serial publications, periodicals → Astronomy → Astronautics → United States |
| NASCOM | NASA Communications | In English | → Telecommunications → Astronautics → United States |
| NASDA | National Space Development Agency | In English | → Central administration → Astronomy → Astronautics |
| NASM | National Air and Space Museum (www.nasm.si.edu) | In English | → Museums → Astronomy → Aeronautics, aircraft → Astronautics → United States |
| NASO | North American Space Operations | In English | → Astronomy → Astronautics |
| NASP | National AeroSpace Plane | In English | → Aeronautics, aircraft → Astronautics |
| NASTRAN | NASA Structural Analysis Program | In English | → Mechanical engineering → Astronautics → United States |
| NATF | Naval Air Test Facility | In English | → Aerodynamics → Aeronautics, aircraft |
| NATS | National Air Traffic Services (www.nats.co.uk) | In English | → Transport and postal services → Aeronautics, aircraft |
| NAVAID | Navigation Aid | In English | → Vehicle engineering |
| NAVDAD | Navigational Derived Air Data | In English | → Aeronautics, aircraft |
| NAVSAT | Navigation Satellite | In English | → Astronautics → Transport and postal services |
| NAVT | NASA Altimeter Verification Telemetry | In English | → Astronautics → United States |
| NBC | Nuclear/Biological/Chemical | In English | → Military engineering |
| NBIC | Nanotechnology, Biotechnology, Information Technology and Cognitive Science | In English | → Computer science → Biotechnology |
| NBIC | Nanotechnologies, Biologie, Information, Cognition | In French | → Biotechnology → Computer science → Neurology |
| NCC | NASA Class Code | In English | → Astronautics → United States |
| NCC | NASA Communications Control | In English | → Telecommunications → Astronautics → United States |
| NCC | Navstar Control Center | In English | → Vehicle engineering |
| NCG | Nuclear Criteria Group | In English | → Nuclear technology |
| NCG | Nederlandse Commissie voor Geodesie | In Dutch | → Organizations and associations → Environmental technology, water supply, waste management → Netherlands |
| NCM | National Corvette Museum (www.corvettemuseum.com) | In English | → Museums → Automobile manufacturing |
| NCO | Numerically Controlled Oscillator | In English | → Electronics |
| NCOS | National Commission On Space | In English | → Astronomy → Astronautics |
| NCPC | National Cleaner Production Centre | In English | → Environmental technology, water supply, waste management |
| ND | NASA Document | In English | → Astronomy → Astronautics → United States |
| NDA | National Decommissioning Authority | In English | → Public administration, government → Nuclear technology |
| NDE | Nondestructive Evaluation | In English | |
| NDGPS | Nationwide Differential Global Positioning System | In English | → Geodesy, cartography → Astronautics → Telecommunications |
| NDI | Nondestructive Inspection | In English | |
| NDRO | Nondestructive Readout | In English | |
| NDS | Nuclear Detection System | In English | → Nuclear technology |
| NDS | Nuclear Data Sheets | In English | → Serial publications, periodicals → Nuclei → Nuclear technology |
| NDT | Nondestructive Test | In English | |
| NDT | Nondestructive Testing | In English | |
| NDTE | Nondestructive Testing and Evaluation | In English | → Serial publications, periodicals → Materials science |
| NDTF | Nondestructive Test Facility | In English | |
| NDTL | Nondestructive Test Laboratory | In English | → Research institutes |
| NDU | Navigation Data Unit | In English | → Vehicle engineering |
| NDV | NASP Derived Vehicle | In English | → Vehicle engineering |
| NEA | Nuclear Energy Agency |
In English | → Organizations and associations → Nuclear technology |
| NEACP | National Emergency Airborne Command Post | In English | → Military engineering → Aeronautics, aircraft |
| NEC | Nederlands Elektrotechnisch Comité | In Dutch | → Organizations and associations → Electrical engineering → Netherlands |
| NEC | National Electrical Code | In English | → Electrical engineering |
| NEC | Nippon Electric Company (www.nec.com) | In English | → Electrical engineering → Electronics → Computer hardware → Japan |
| NEDAP | Nederlandsche Apparatenfabriek (www.nedap.nl) | In Dutch | → Computer science → Electronics |
| NEDO | New Energy and Industrial Technology Development Organization | In English | → Organizations and associations → Industry, industrial policy → Energy economics |
| NEEDS | NASA End-To-End Data System | In English | → Data → Astronomy → Astronautics → United States |
| NEI | Nonexplosive Initiation | In English | → Military engineering |
| NEK | Norsk Elektroteknisk Komite | In Norwegian | → Organizations and associations → Electrical engineering → Norway |
| NELS | Nuclear Effects Link Simulator | In English | → Nuclear technology |
| NEM | Newmont Mining Corporation | In English | → Mining |
| NEM | Normes Européennes de Modélisme (ferroviaire) | In French | → Standardization → Entertainment → Rail transport engineering → Europe |
| NEMA | National Electrical Manufacturers Association | In English | → Associations → Electrical engineering |
| NEMA | National Electric Manufacturers Association (www.nema.org) | In English | → Associations → Electrical engineering |
| NEMS | NASA Equipment Management System | In English | → Maintenance and logistics → Astronautics → United States |
| NER | Nordic Energy Research (www.nordicenergy.net) | In English | → Energy economics |
| NERSA | National Energy Regulator of South Africa (www.ner.org.za) | In English | → Central administration → Energy economics → Africa |
| NERSA | (Société centrale) Nucléaire Européenne à neutrons Rapides SA | In French | → Nuclear technology → Electrical engineering |
| NERVA | Nuclear Engine for Rocket Vehicle Application | In English | → Nuclear technology → Astronautics |
| NESC | National Electrical Safety Code | In English | → Electrical engineering |
| 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 |
| NEST | Nuclear Emergency Search Team | In English | → Nuclear technology |
| NEST | New and Emerging Science and Technology | In English | → Research policy → European Union → Europe |
| NEST | New and Emerging Strategic Technologies | In English | → Research policy → International relations → India |
| NET | NASA Employee Team | In English | → Astronautics → United States |
| NETA | New Electricity Trading Arrangements | In English | → Electrical engineering |
| NETWEIs | New and Emerging Technologies - Wege zur Erkennung und Implementierung für KMUs | In German | → Research policy |
| NEVS | NASA Equipment Visibility System | In English | → Astronautics → United States |
| NEWS | New Engineering Work Schedule | In English | |
| NEWS | New Engineering Work System | In English | |
| NFS | NASA FAR Supplement | In English | → Astronautics → United States |
| NFS | Nordisk Flaggselskap (www.nordicflagsociety.org) = NFS | Nordic Flag Society | In English = NFS | Nordisk Flagselskab | In Danish = NFS | Pohjoismaiden Lippuseura | In Finnish = NFS | Norræna Fánafélagið | In Icelandic = NFS | Nordiska Flaggsällskapet | In Swedish |
In Norwegian | → Organizations and associations → 6299 |
| NFS | Nordic Flag Society (www.nordicflagsociety.org) = (look above) |
In English | → Organizations and associations → 6299 |
| NFS | Nordisk Flagselskab (www.nordicflagsociety.org) = (look above) |
In Danish | → Organizations and associations → 6299 |
| NFS | Pohjoismaiden Lippuseura (www.nordicflagsociety.org) = (look above) |
In Finnish | → Organizations and associations → 6299 |
| NFS | Norræna Fánafélagið (www.nordicflagsociety.org) = (look above) |
In Icelandic | → Organizations and associations → 6299 |
| NFS | Nordiska Flaggsällskapet (www.nordicflagsociety.org) = (look above) |
In Swedish | → Organizations and associations → 6299 |
| NGA | National Geospatial-Intelligence Agency | In English | → Central administration → Astronautics |
| NGT | NASA Ground Terminal | In English | → Astronautics → United States |
| NH&S | Nuclear Hardening and Survivability | In English | → Nuclear technology |
| NHB | NASA Handbook | In English | → Astronautics → United States |
| NICE | Nizhny Novgorod Innovation Center for Energy Saving | In English | → Energy economics |
| NIFES | National Industrial Fuel Efficiency Service | In English | → Energy economics → Vehicle engineering |
| 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 |
| NIFS | National Institute for Fusion Science | In English | → Research institutes → Nuclear, atomic, and molecular physics → Nuclear technology |
| NIFTE | Non-Inertive Feedback Thermofluidic Engine | In English | → Mechanical engineering |
| NIM | Nuclear Instrumentation Module | In English | → Nuclear technology |
| NIMP | Nuclear Instruments and Methods in Physics Research | In English | → Serial publications, periodicals → Nuclei → Nuclear technology |
| NIMS | National Institute for Materials Science (www.nims.go.jp) | In English | → Research institutes → Materials science → Japan |
| NIST | National Institute for Standardization and Technology (www.nist.gov) | In English | → Standardization |
| NIST | National Institute of Standards and Technology (www.nist.gov) | In English | → Standardization |
| NISTJ | National Institute of Standards and Technology Journal of Research | In English | → Serial publications, periodicals → Standardization |
| NITLE | National Institute for Technology and Liberal Education | In English | → Education |
| NLAW | Next generation Light Anti-armour Weapon | In English | → Military engineering |
| 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 |
| NMAB | National Materials Advisory Board | In English | → Organizations and associations → Materials science |
| NMBS | Nationale Maatschappij der Belgische Spoorwegen (www.b-rail.be) = SNCB | Société Nationale des Chemins de fer Belges | In French |
In Dutch | → Rail transport engineering → Transport and postal services → Belgium |
| NMCC | National Military Command Center | In English | → Military engineering |
| NMD | National Missile Defence program | In English | → Military affairs → Military engineering |
| NMI | NASA Management Instruction | In English | → Management → Astronautics → United States |
| NMI | National Maritime Institute | In English | → Marine research, oceanography → 627 → 6295 |
| NMOS | Negative-Type Metal Oxide Semiconductor | In English | → Electronics |
| NMR | Nuclear Magnetic Resonance = RMN | Résonance Magnétique Nucléaire | In French = RMN | Ressonància Magnètica Nuclear | In Catalan = RMN | Risonanza Magnetica Nucleare | In Italian = תמ"ג | תהודה מגנטית גרעינית | In Hebrew = ЯМР | Я́дерного магни́тного резона́нса | In Russian = НМР | Нуклеарна магнетна резонанција | In Serbian |
In English | → Medicine → Nuclear, atomic, and molecular physics → Nuclear technology |
| NMRA | National Model Railroad Association | In English | → Associations → Entertainment → Rail transport engineering |
| NMTBA | National Machine Tool Builders' Association | In English | → Associations → Mechanical engineering |
| NMTS | Next Manned Transportation System | In English | → Vehicle engineering |
| NNPT | Nuclear Non-Proliferation Treaty | In English | → International relations → Nuclear technology → Military engineering |
| NNSA | National Nuclear Security Administration | In English | → Central administration → Nuclear technology |
| 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 |
| NOMIS | Nuclear Operations and Maintenance Information Service | In English | → Nuclear technology |
| 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 |
| NORM | Naturally Occurring Radioactive Material | In English | → Nuclear technology |
| 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 |
| NPDES | National Pollutant Discharge Elimination System | In English | → Environmental technology, water supply, waste management |
| NPL | Normal Power Level | In English | → Electrical engineering |
| NPN | NASA Part Number | In English | → Astronautics → United States |
| NPS | NASA Planning Studies | In English | → Astronautics → United States |
| NPS | Nonpropulsive Stage | In English | → Astronautics |