(Telekommunikation), NMD, National Missile Defense (USA), NML, Network Management Layer (Telekommunikation), NMN, Niedersächsischer Monographiennachweis, NMOS, N-Channel MOS, NMR, Network Measure Radio (Telekommunikation), NMR, Nuclear Magnetic Resonance, NMS, National Measurement System (UK), NMS, Network Management System (Rechnernetze), NN, Neural Network, NNI, Network-Node (oder: -Network) Interface (Rechnernetze), NNI, Noise/News International (Zeitschrift), NNPA, Nuclear Non-Proliferation Act, NNSA, National Nuclear Security Administration (DoE, USA), NNV, Nederlandse Natuurkundige Vereniging, NOAA, National Oceanic and Atmospheric Administration (USA), NOAO, National Optical Astronomy Observatories (USA), NOC, Network Operating Center (Telekommunikation), NOE, Neutrino Oscillation Experiment (Gran Sasso, Italien), NOEKS, Nonlinear Optics and Excitation Kinetics in Semiconductors, NOL, Naval Ordnance Laboratory (USA), NOLM, Nonlinear Optical Loop Mirror, NOMAD, Neutrino Oscillation Magnetic Detector (CERN), NOMS, Network Operations and Management, NORAD, North American Air Defense (Command), NOW, Network of Workstaions, NP, Nondeterministic Polynomial, NP, Nuclear Physics, NPC, Nomadic Personal Communications, NPE, Network Protection Equipment (Kommunikation), NPE, Nuclear Physics Electronic, NPG, New General Catalogue (Astronomie), NPL, National Physical Laboratory (Teddington, UK), NPOI, Navy Prototype Optical Interferometer (Lowell Observatory, Anderson Mesa, near Flagstaff, AZ, USA), NPP, Net Primary Production (Pflanzenmasse), NPT, Non-Proliferation Treaty (Atomsperrvertrag), NQR, Nuclear Quadrupole Resonance, NRAO, National Radio Astronomy Observatory (USA), NRC, National Research Council (USA), NRC, Non-Resonant Cavity (LED), NRC, Nuclear Regulatory Commission, NRDC, National Research and Development Corporation (London), NREL, National Renewable Energy Laboratory (Golden, CO, USA), NREN, National Research and Education Network (USA), NRIM, National Research Institute for Metals (Tsukuba, Japan), NRIM, Network Resource Information Model, NRL, Naval Research Laboratory (Washington, DC, USA), NRQM, Nichtrelativistische Quantenmechanik, NRW, Nordrhein-Westfalen, NRZ, Non-Return-To-Zero (Telekommunikation), NSA, National Security Agency (USA), NSAC, Nuclear Science Advisory Committee (USA), NSAID, Nonsteroidal Anti-Inflammatory Drugs, NSBF, National Scientific Balloon Facility (NASA), NSC, National Security Council (USA), NSCA, National Sound and Communications Association (USA), NSCL, National Superconducting Cyclotron Laboratory (USA), NSD, Network Services Division, NSERC, Natural Sciences and Engineering Research Council (USA), NSF, National Science Foundation (USA), NSFNET, National Science Foundation Network (USA), NSG, Nuclear Suppliers Group (,,Londoner Gruppe''), NSM, National Society Member (EPS u. a.), NSOM, Near-Field Scanning Optical Microscope (und: ... Microscopy), NSP, Network Service Point (oder: Provider) (Internet), NSPE, National Society of Professional Engineers, NSRT, Non-Sequential Ray Tracing (?), NSS, Network Subsystem (Telekommunikation), NSS, Neutraler Salzsprühtest (auf Korrosionsbeständigkeit), NSSA, Neutron Scattering Society of America, NSSK, North-South Station Keeping (Satelliten), NSTA, National Science Teachers Association (USA), NSTC, National Science and Technology Council (USA), NSTX, National Spherical Torus Experiment (PPPL, USA), NSUB, Niedersächsische Staats- und Universitätsbibliothek (Göttingen), NSWC, Naval Surface Warfare früher: Weapons Center (Silver Spring, MD, USA), NT, Network Termination (Datennetze), NTG, Nachrichtentechnische Gesellschaft (im VDE), NTIS, National Technical Information Service (Datenbank, USA), NTO, Nitrotriazolon (Sprengstoff), NTS, Nuclear Test Site, NTSC, National Television System Committee (Fernsehnorm, USA), NTT, New Technology Telescope (ESO, La Silla, Chile), NTU, National Taiwan University, NTZ, Nachrichtentechnische Zeitschrift, NuPECC, Nuclear Physics European Collaboration Committee, NUREG, U.S. Nuclear Regulatory Commission, NUSC, Naval Underwater Systems Center (USA), NV, Nevada (US-Staat), NVH, Noise, Vibration and Harshness, NVM, Non Volatile Memory, NVOD, Near Video-On-Demand, NVV, Nichtverbreitungsvertrag (Atomwaffen, 1968), NVvL, Niederländische Aeroakustische Gesellschaft , NW, Network (Telekommunikation), NWB, Niedergeschwindigkeits-Windkanal Braunschweig, NWK, Network Analyser (DECT), NWK, Nuklearwaffenkonvention, NWO, (Niederländische Wissenschaftsorganisation), NY, New York (US-Staat), NYAS, New York Academy of Sciences, NZDSF, Non-Zero Dispersion Shifted Fiber (Glasfaser, Kommunikation), NZN, Niedersächsischer Zeitschriftennachweis, NZZ, Neue Zürcher Zeitung, O, OA, Outgoing Access, OAAC, Optical Aerial Attached Cable, OADM, Optical Add-Drop Multiplexer (optische Telekommunikation), OAE, Otoakustische Emissionen, ÖAL, Österreichischer Arbeitsring für Lärmbekämpfung, OAM, Operation, Administration and Maintenance (Telekommunikation), OAMP, OAM Provisioning, OAN, Optical Access Node (Glasfasernetz), OAS, Open Access Service (Telekommunikation), OAS, Operator Assisted Service (Telekommunikation), OASIS, Optimal Architecture Sensor Interface System, OATC, Open Area Test Site, OAU, Organization for African Unity (?), OBDMS, Object-Oriented Database Management System, OBL, Outside Broadcasting Link, OBMC, On Board Multimedia Controller (Telekommunikation), OBMP, On Board Multimedia Processor (Telekommunikation), OBP, On Board Processing (oder: Processor), OBS, Optical Burst Switch (Telekommunikation), OBW, Occupied Bandwidth (Telekommunikation), OCaB, Outgoing Call Barrier, OCDM, Optical Code Division Multiplexing (optische Telekommunikation), O-CDMA, Optical Code Division Multiple Access (Glasfasernetz), OCH, Optical Channel (Telekommunikation), OCh-SPRING, Optical Channel Shared Protection Ring (optische Telekommunikation), OCR, Optical Character Recognition (Computer-lesbare Schrift), OCT, Optical Coherence Tomography, OCT, Optical Component Test, ODBC, OPen Data Base Connectivity (Telekommunikation), ODC, Ornithindecarboxylase, ODE, Ordinary Differential Equation, ODL, Object Definition Language (Telekommunikation), ODL, Open and Distance Learning (EU-Programm), ODP, Ocean Drilling Project (oder: Program), ODP, Open Distributed Processing, ODT, Order-Disorder Transition, OECD, Organization for Economic Cooperation and Development, OEIC, Optoelectronic Integrated Circuit, opto-elektronischer IC, OELR, Overall Echo Loudness Rating (Telekommunikation), OEM, Opto-elektronischer Modulator (?), OEM, Original Equipment Manfacturer, OENN, Optoelectronic Neural Network, O/E/O, Optical Electronic Optical (optische Telekommunikation), OFA, Optical Fiber Amplifier, OFAT, One-Factor-at-a-Time (Experimentiertechnik), OFC, Optical Fiber Communications, OFCCC, Optical Fiber Cable Competence Center, OFDM, Optical (oder: Orthogonal) Frequency Division Multiplexing, OFET, Organischer Feldeffekt-Transistor (optische Telekommunikation), OFI, Optical Field Ionization, OFMeC, Optical Fibre Measurement Club (UK), OFW, Oberflächenwellen, OG, Optical Gateway (optische Telekommunikation), ÖGAI, Österreichische Gesellschaft für Artificial Intelligence, OH, Ohio (US-Staat), ÖIB, Örtliche Initiativen zur Beschäftigung von Frauen (EU), OIDA, Optoelectronic Industry Development Association, OIF, Optical Interworking Forum, OK, Oklahoma (US-Staat), OL, Output Layer (neuronales Netz), OLA, Optical Line Amplifier (optische Telekommunikation), OLE, Object Linking and Embedding (Programmierung), OLE, Opto & Laser Europe (Zeitschrift, Bristol, UK), OLED, Organic Light-Emitting Diode (oder: Device), OLS, On-Line Service (Internet), OLT, Optical Line Termination (optische Telekommunikation), OLTE, Optical Line Termination Equipment, OLTP, Online Transaction Processing, OM, Optical Monitor (XMM), O&M, Operations and Maintenance, OMAC, Open Modular Architecture Controller, OMB, Office of Management and Budget (USA, White House), OMC, Operations and Maintenance Center (Telekommunikation), OMC, Optical Metrology Centre, OMF, Observation Markup Format, OMG, Object Management Group, OMI, Open Microprocessor Systems Initiative, OMI, Optical Modulation Index, OMS, Operations and Maintenance Station (Telekommunikation), OMS, Optical Multiplex Station (Telekommunikation), OMSG, OptinexTM Multi-Service Gateway (optische Telekommunikation), OMSN, OptinexTM Multi-Service Node (optische Telekommunikation), OMT, Object Modelling (and) Technique, OMUX, Output Multiplexer (Telekommunikation), ON, Optical Network (Telekommunikation), ONERA, Office National d'Etudes et de Recherches Aérospatiales, ONP, Open Network Provision(ing), ONR, Office of Naval Research (USA), ONSA, Organization for Nucleotid Sequencing and Analysis (?) (São Paulo, BR), ONTA, Oxynitrotriazol (Sprengstoff), ONU, Optical Network Unit, OO, objektorientiert, OODB, Object-Oriented Database, OOP, objektorientierte(s) Programm(entwicklung), OOT, objektorientierter Test, OPAL, Optical Access Line, optische Anschlußleitung (Telefon), OPCPA, Optical Parametric Chirped-Pulse Amplification, OPEC, Organization of Petrol Exporting Countries, Organisation Erdöl exportierender Staaten, OPEN, Optical Pan-European Network, OPEP, One-Pion Exchange Potential, ÖPG, Österreichische Physikalische Gesellschaft, OPGW, Optical Ground Wire (Glasfasernetz), OPIT, Oxide Powder in Tube, ÖPNV, Öffentlicher Personen-Nahverkehr, OPO, Optical Parametric Oscillator, OPP, Optical Precipitate Profiler, OPS, Official Production System, OPS, Optical Path Switch (Telekommunikation), OPS, Optical Protection System (optische Telekommunikation), OPS, Optically Pumped Semiconductor (Laser), OPZ, Operationszentrale, OR, Oregon (US-Staat), ORB, Object Request Broker (Telekommunikation), ORE, Office de Recherche et d'Essais, ORF, Österreichischer Rundfunk, org, other organizations (Internet, USA), ORI, Office of Research Integrity, ORM, Observatorio del Roque de los Muchachos (La Palma), ORMAK, Oak Ridge Tokamak (Fusionsreaktortechnik, Oak Ridge National Laboratory), ORNL, Oak Ridge National Laboratory (TN, USA), ORSTOM, (Internationale Hilfsorganisation Frankreichs), OS, Operating System, OSA, Optical Society of America, OSB, Oriented Structural Board (Spanplatte), OSC, Optical Supervisory Channel (Glasfasernetz), OSC, Outbound Signalling Channel (Telekommunikation), OSD, On Screen Display (Funktionsanzeige auf TV-Schirm), OSF, Open Software Foundation, OSF, Operation System Function, OSHA, Occupational Safety and Health Administration (Washington, DC, USA), OSI, Open Source Initiative, OSI, Open Systems Interconnection (Datennetze), OSI, Optical Stellar Interferometer, OSIRIS, Off-Shore Integrated Robotic Inspection System, OSNCP, Optical Subnetwork Connection Protection (optische Telekommunikation), OSNR, Optical Signal-to-Noise Ratio (optische Telekommunikation), OSP, Open Services Platform (Telekommunikation), OSPF, Open Shortest Path First (Internet), OSS, Office of Strategical Services (USA), OSS, Operations Support System (Internet), OSSE, Oriented Scintillation Spectrometer Experiment, OST, Observatoire des Sciences et des Techniques (Frankreich), OST, Office of Science and Technology (UK), OSTP, Office of Science and Technology Policy (USA, White House), OSZE, Organisation für Sicherheit und Zusammenarbeit in Europa, OTA, Office of Technology Assessment (USA, Congress), OTC, One Touch Com (Telekommunikation), OTDM, Optical Time Division Multiplexing, OTDR, Optical Time Domain Reflectometry, OTS, Optical Transmission System (optische Telekommunikation), OU, Open University (UK), OVC, Output Variance Constraint, OVRO, Owens Valley Radio Observatory, OXC, Optical Cross Connect (optische Telekommunikation), OZIPM, Ozone Isopleth Plotting with Optional Mechanism, P, PA, Pennsylvania (US-Staat), PABX, Private Automatic Branch Exchange, Private digitale Nebenstellenanlage, PAC, Perturbed Angular Correlation, PAC, Processing and Archiving Center, PAC, Programme Advisory Committee (TC im ETSI), PACE, Planar Articulating Controls Experiment, PACS, Photoconductor Array Camera and Spectrometer (FIRST), PACS, Physics and Astronomy Classification Scheme, PAD, Packet Assembly/Disassembly, PAD, Perturbed Angular Distribution, PAFC, Phosphoric Acid FC (?), PAH, Polycyclic Aromatic Hydrocarbon, PAK, Polyzyklische aromatische Kohlenwasserstoffe, PAL, Phase Alternation Line (Fernsehen), PAL, Pohang Accelerator Laboratory (Korea), PALC, Plasma Addressed Liquid Crystal, PALS, Photoacoustic Laser Spectroscopy, PALS, Prague Asterix Laser System, PAMA, Preassigned Multiple Access (Telekommunikation), PAN, Polyacrylonitrile, PARCOR, Partial Correlation, PAS, Pädagogische Arbeitsstelle des deutschen Volkshochschulverbandes (Frankfurt/M), PAY, Physics Achievement Year, PBDE, polybromierte Diphenylether, PBET, Photonic Basis for Engineers and Technicians (California, USA), PBH, Physikzentrum Bad Honnef (DPG), PBI, Physics-Based Industries, PBN, pyrolytisches Bornitrid, PBO, Polybenzobioxazol, PBS, Primer-Bindungsstelle (in RNA), PBT, Polybutylenterephthalat, Poly Butylene Terephthalate, PBX, Plastic Bonded Explosive (Sprengstoff), PBX, Private Branch Exchange (Internet), PBX-M, Princeton Beta Experiment - Modified (Fusionsreaktortechnik), PC, Personal Computer, PC, Polycarbonat, PCA, Proportional Counter Array (beim RXTE), PCAST, President's Committee of Advisers on Science and Technology (USA), PCB, polychlorierte Biphenyle, PCB, Printed Circuit Board, PCC, Partial Correlation Coefficient, PCC, polychloriertes Camphen, PCD, Power Control Device, PCDE, Peak Code Domain Error (Telekommunikation), PCF, Photonic Crystal Fibre, PCF, Polymer Cladded Fiber (optische Telekommunikation), PCI, Peripheral Component Interconnect (Datenbus), PCIMG, PCI Industrial Computers Manufacturers Group, PCM, Phase Change Material, PCM, Puls-Code-Modulation, PCMCIA, Personal Computer Memory Card International Association, PCN, Personal Communications Network, PCO, Point of Control and Observation (Telekommunikation), PCO, Public Call Office (Telephon), PCP, Pentachlorphenol, PCR, Peak Cell Rate (Telekommunikation), PCR, Polymerase Chain Reaction, PCR, Predictive Control of Reactors, PCS, Personal Communications Service (oder: System), PCS, Photon Correlation Spectroscopy, PCSS, Personal Communication Satellite Systems, PCT, Patent Cooperation Treaty, PCU, Packet Control Unit (Telekommunikation), PCU, Power Conditioning Unit, PCU, Power Control Unit, PCX, Private Communication Exchange (Telekommunikation), PD, Privatdozent, PD, Proportional-Derivative (Control), Proportional-Differential (Regler), PDA, Personal Digital Assistent (Telekommunikation), PDC, Personal (oder: Portable) Digital Cellular (Telekommunikation), PDCH, Packet Data Channels (Telekommunikation), PDD, Photodynamische Diagnostik, PDE, Partial Differential Equation, PDE, Phosphodiesterase, PDF, Portable Document Format, PDF, Probability Density Function, PDGF, Platelet-Derived Growth Factor (Blutplättchen-Wachstumsfaktor), PDH, Plesiochronous Digital Hierarchy (Telekommunikation), PDI, Paul-Drude-Institut für Festkörperelektronik (Berlin), PDL, Page Description Language (Printer Server), PDL, Polarization Dependent Loss (optische Telekommunikation), PDLC, Polymer-Dispersed Liquid Crystal, PDM, Product Data Management, PDMS, Polydimethylsiloxan, PDN, Packet Data Network (Telekommunikation), PDO, Packet Data Optimized (Telekommunikation), PDP, Packet Data Protocol (Telekommunikation), PDP, Plasma Discharge (oder: Display) Panel, PDR, Preliminary Design Review, PDS, Payload Data Segment (Telekommunikation), PDS, Permanent Data Storage System, PDS, Polydioxanon, PDT, Photodynamic Therapy, Photodynamische Therapie, PDU, Packet Data Unit (Telekommunikation), PDU, Protocol Data Unit (Internet), PDX, Princeton Divertor Experiment (Fusionsreaktortechnik, PPPL), PE, Phase Error (Telekommunikation), PE, Polyethylen, PE, Prediction Error, PEACE, Process Execution and Communication Environment, PECVD, Plasma-Enhanced Chemical Vapor Deposition, PEEM, Photo-Emission Electron Microscope, Photoemissions-Elektronenmikroskop, PEG, Polyethylenglykol, PEM, Photon Emission Microscopy, PEM, Polymer-Elektrolyt-Membran (Brennstoffzelle), PEM, Proton Exchange Membrane (Brennstoffzelle), PEMFC, Polymer Electrolyte Membrane FC, PEN, Physics Education News, PEO, Polyethylenoxid, PEPS, Performance Evaluation of Parallel Systems (Europäisches Forschungsprojekt), Per, Perchlorethen, PERL, Passivated Emitter and Rear, Locally Diffused (Solarzellen), Perl, Practical Extraction and Report Language (scherzhaft auch: Pathologically, Eclectic Rubbish Lister) (Textmanipulation), PESC, Power Electronics Specialist Conference, PET, Polyethylenterephthalat, PET, Positronen-Emissions-Tomographie, Positron Emission Tomography, PETRA, Positron-Elektron-Tandem-Ring-Anlage (DESY), PFAU, Programm zur finanziellen Absicherung von Unternehmensgründern aus Hochschulen, PFD, Power Flux Density, PFE, Power Feeding Equipment, PG, Peer Group, PGA, Pin Grid Array (Chipgehäuse), PGA, Polyglykolid, PGO, (Hirn-Zellkomplex: pons, corpus geniculatum, occiput), PGP, Pretty Good Privacy, PHA, Polyhydroxyalkanoat, PHARE, Poland and Hungary Action for Economic Restructuring, PHB, Per Hop Behaviors, PhD, Doctor of Philosophy, PHENIX, Pioneering High Energy New Ion Experiment (RHIC), PHI, Planbasierte Hilfesysteme, PHM, Prognostics and Health Managament, PHS, Personal Handyphone System, PHS, Peripheral High Speed (Bus), PHT, plötzlicher Herztod, PHY, Physical Layer (DECT), PI, Proportional-Integral (Control), Proportional-Integral (Regler), PIA, Positronen-Intensitäts-Akkumulator (DESY), PIAFE, Projet d'Ionisation et d'Accélération de Faisceaux Exotiques (Grenoble), PIC, Photonic Integrated Circuit, PICA, Picosecond Imaging Circuit Analysis, PICS, Protocol Implementation Conformance Statement (Telekommunikation), PID, Präimplantationsdiagnostik (Genetik), PID, Proportional, Integral, Derivative (Control), Proportional-Integral-Differential (Regler), PIDC, Prototype International Data Center (Arlington, VA), PII, Publisher Item Identifier, PIK, Potsdam-Institut für Klimafolgenforschung, PIM-SM, Protocol Independent Multicast - Sparse Mode (Internet), PIN, Personal Identification Number, PIN, Photodiode aus 3 Schichten: `p'-type, `i'ntrinsic, `n'-type semiconductor , Positive-Intrinsic-Negative, PINET, Physics Information Network, PINT, PSTN/Internet Interworking Group (Internet), PIP, Picture in Picture (TV: kleines Zusatzbild von anderem Sender), PIPS, Passivated, Implanted, Planar Silicon (detectors), PIU, produktionsintegrierter Umweltschutz, PIV, Particle Image Velocimetry, PKC, Public-Key Cryptography, PKE, Pluto-Kuiper Express (Raumfahrtprojekt), PKM, Parallel Kinematic Machine (Robotik), PKY, Parkway (US Mail), PL