Photoluminescence, Photolumineszenz, PL, Place (US Mail), PLA, Polylactid, PLC, Packet Loss Concealment (Telekommunikation), PLC, Powerline Communication, PLC, Programmable Logic Controller, p.l.c., public limited company (UK), PLD, Pulsed Laser Deposition, PLE, Photolumineszenz-Anregungsspektroskopie, PLED, Polymeric Light-Emitting Diode, PLL, Phase-Locked Loop, PLMN, Public Land Mobile Network (Telekommunikation), PLO, Phase-Locked Oscillator, PLP, Perceptual Linear Prediction, PLT, Princeton Large Experiment (Fusionsreaktortechnik, PPPL), PLZ, Plaza (US Mail), PLZ, Postleitzahl, PM, Photomultiplier (tube), PMB, Polarization Mode Dispersion, PMC, Personal Mobile Communicator, PMD, Polarization-Mode Dispersion (Glasfasernetz), PMD, Portable MAC Identity for Display (DECT), PMF, Polarization Maintaining Fiber (optische Telekommunikation), PMMA, Polymethylmethacrylat, PMO, Program Managament Office, PMOS, P-Channel MOS, PMP, Point-to-Multipoint (Telekommunikation), PMS, Puls-Magnetron-Sputtern (Dünne Schichten), PMSJ, Physico-Mathematical Society of Japan, PMSS, Polymethylsilsesquioxan Si(CH3)O1,5 n, PMT, Photomultiplier Tube, PMV, Predicted Mean Vote, PMW, Project Management Workbench, PNAS, Proceedings of the National Academy of Sciences, PNE, Peaceful Nuclear Explosion, PNGV, Partnership for a New Generation of Vehicles, PNNI, Private Network-Node (oder: Network) Interface (Internet), PNNL, Pacific Northwest National Laboratory (USA), PNO, Private Network Operator, PNP, Purinnucleosid-Phosphorylase, POC, Particulate Organic Carbon, POF, Polymer (or: Plastic) Optical Fiber, POEM, Programme for Observation of the Earth and its Environment, POINTS, Precision Optical Interferometer in Space, PON, Passive Optical Network, PONS, Prometheus Orthonormal System, POP, Point of Presence (Internet), POP, Post Office Protocol (E-Mail Server), POPA, Panel on Public Affairs (APS), PoS, Packet over SONET (oder: SDH), POSIX, Portable Operating System Interface (Telekommunikation), POST, Parliamentary Office of Science and Technology (UK), POSTECH, Pohang University of Science and Technology (Korea), PostEurop, Association of European Public Postal Operators, POTS, Plain Old Telephone Service (oder: System), POW, Prisoner of War, PP, Point to Point (Telekommunikation), PP, Polypropylen, PP, Portable Part (z.B. Handset) (DECT), PPADC, Pulse Processing Analog-to-Digital Converter, PPARC, Particle Physics and Astronomy Research Council (UK), PPAU, Packet Processor and Access Unit, ppb, parts per billion, 10-9, PPD, Predicted Percentage of Dissatisfied, PPF, Positive Position Feedback, PPF, Print Production Format, PPG, Pacific Proving Ground (Atombomben-Testgebiet), PPL, Passive Photonic Loop, PPLN, Periodically-Poled Lithium Niobate, ppm, parts per million, 10-6, PPMS, Physical Property Measurement System, PPN, Parametricized Post-Newtonian (Gravitationstheorie), PPP, Point-to-Point Protocol (Internet), PPP, Poly(p-Phenylen), PPP, Public/Private Partnership (Telekommunikation), PPPL, Princeton Plasma Physics Laboratory (Fusionsreaktortechnik), PPR, Pflegepersonalregelung, PPS, The Polish Physical Society, PPTP, Point-to-Point Tunneling Protocol (Internet), PPV, Poly(p-Phenylen Vinylen), PR, Puerto Rico (US Mail), PRA, Primary Rate Access (ISDN), PRBS, Pseudorandom Bit Sequence, PRC, Primary Reference Clock (Telekommunikation), PRI, Primary Rate Interface (Telekommunikation), PRIF, Peace Research Institute Frankfurt, PROLA, Physical Review Online Archive, PROLOG, Programming in Logic, PROM, Programmable Read-Only Memory, PROMED, Program to Monitor Emerging Diseases, PROMETHEUS, Programme for a European Traffic with Highest Efficiency and Unprecedented Safety, PSA, Plataforma Solar de Almeria (Solarkraftwerk), PSA, Prostata-spezifisches Antigen, PSAB, Physics, Space and Astronomy Board (UK), PSAC, The President's Advisory Committeee (USA), PSBT, Phase Shifted Binary Transmission (Telekommunikation), PSC, Pittsburgh Supercomputing Center (USA), PSC, Polar Stratospheric Cloud (siehe Ozonloch), PSCF, Pure Silica Core Fiber (optische Telekommunikation), PSD, Position-Sensing Detector, PSD, Power Spectral Density, PSE, Personal Service Environment (Telekommunikation), PSE, Programm- und Systementwicklung, PSF, Point Spread Function, PSG, Programmable Sound Generator, PSI, Paul Scherrer Institut (Villingen, CH), PSI, Program Specific Information, PSI, Programmable Serial Interface, PSID, Panel Study of Income Dynamics (USA), PSJ, The Physical Society of Japan, PSOLA, Pitch-Synchronous Overlap Add (Sprachsynthese), PSPC, positionsempfindlicher Proportionalzähler (Röntgensatelliten), PSR, Precision Segmented Reflector (Satelliten), PSSC, Physical Sciences Study Committee (USA), PST, Fraunhofer- Patentstelle für die Deutsche Forschung (München), PSTM, Photon Scanning Tunneling Microscope, PSTN, Public Switched Telephone Network (Öffentliches Fernsprechnetz), PTA, Personal Travel Assistent, PTB, Physikalisch-Technische Bundesanstalt (Braunschweig), PTFE, Polytetrafluoreth(yl)en, PTI, Physikalisch-Technisches Institut (DDR, Jena), p.t.o., please turn over (,  b.w.), PTO, Public Telecommunications Operator, PtP, Peer-to-Peer (Telekommunikation), PTR, Physikalisch-Technische Reichsanstalt (Berlin, ab 1887), PTRA, Physics Teaching Resource Agents, PTT, Post, Telegraph and Telephone, PTV, Projection Television, PTZ, Produktionstechnisches Zentrum (FhG, Berlin), PU, Polyurethan, PU, produktintegrierter Umweltschutz, PUNE, Peaceful Uses of Nuclear Energy, PUR, Plutonium and Uranium Extraction (Radioaktiver Abfall), PUR, Polyurethan, PUSH, Partnernetz für Unternehmensgründungen aus Stuttgarter Hochschulen, PUSH, Public Understanding of the Sciences and Humanities, PV, Photovoltaik, PV, Present Value, PVB, Polyvinyl Butyral, PVC, Permanent Virtual Circuit (oder: Channel) (Rechnernetz), PVC, Polyvinylchlorid, PVD, Physical Vapor Deposition, PVDF, Polyvinylidenfluorid, PVK, Poly-N-vinylcarbazol, PVM, Parallel Virtual Machine (Parallelrechner), PWM, Pulse Width Modulation, PXI, PCI Extensions for Instrumentation, PyC, Pyrokohlenstoff, PZT, Lead Zirconate Titanate, Q, Q, Q-Factor, Quality Factor, Gütefaktor, QA, Quality Assurance, Q&A, Questions and Answers, QALY, Quality-Adjusted Life Years, QAM, Quadrature Amplitude Modulation, QAR, Quantitative Autoradiography (Medizin), QAU, Quality Assurance Unit, QBD, Quasi-Birth-and-Death, QBER, Quantum Bit-Error Rate, QC, Quality Control, QCD, Quantum Chromodynamics, Quantenchromodynamik, QCL, Quantum Cascade Laser, QED, Quantenelektrodynamik, qed, quod erat demonstrandum (,  was zu beweisen war), QELS, Quantum Electronics and Laser Science (Conference), QFD, Quality Function Deployment, QFL, Quantum Fountain Laser, QFT, Quantenfeldtheorie, QHE, Quantum Hall Effect, Quanten-Hall-Effekt, QKD, Quantum Key Distribution (Kryptographie), QM, Quality Management, Qualitätsmanagement, QM, Quantum Magnetics, QMC, Quanten-Monte-Carlo (-Technik), QMS, Quasi-monokristalline Siliziumschicht, QND, Quantum Nondemolition Measurement (rückwirkungsfreie Quantenmessung), QOS, Quality of Service, QPO, Quasi-Periodic Oscillations (Röntgensterne), QPSK, Quadrature Phase Shift Keying (Modulation), QSAR, Quantitative Structure-Activity Relationship (Chemie), QSIG, Q Interface Signaling, QSM, Qualitative Software Metrics, QSVD, Quotient Singular Value Decomposition, QTVR, Quick Time Virtual Reality, QUANTOM, Quantitative Tomographiedatenanalyse, QUIC, Quantum Information and Computation Consortium, QW, Quantum Well, QWIP, Quantum Well Infrared Photodetector, R, RA, Radio Access (Telekommunikation), RA, Research Assistant (USA), RAB, Remote Amplifier Box (Telekommunikation), RACE, Research and Development in Advanced Communication Technologies in Europe, oder: Research (Programme) on (oder: into) Advanced Communication(s) in Europe , RAD, Rapid Application Development, RADAR, Radio Detection and Ranging, RADIUS, Remote Authentication Dial-In User Service (Telekommunikation), RAeS, UK Aeroakustische Gesellschaft , RAID, Redundant Array of Inexpensive Disks, RAINBOW, Reduced and Internally Biased Oxide Wafer (piezoelektrischer Aktuator), RAIRO, Revue Française d'Automatique, Informatique et Recherche Opérationelle, RAL, Rutherford-Appleton Laboratory (Oxford-Chilton, UK), RAM, Random Access Memory, RAM, Remote Access Multiplexer (Internet), RAN, Remote Access Node (Telekommunikation), RANAP, Radio Access Network Application Part (Telekommunikation), RAP, Radio Access Profile (Telekommunikation), RAPID, Research and Public Information and Dissemination (USA, Programm zu EMF-Schäden), RARDE, Royal Armament Research and Development Establishment (UK), RAS, Reflectance Anisotropy Spectroscopy, RAS, Registration, Admission and Status (Kommunikation), RAS, Remote Access Server (oder: Service) (Telekommunikation), RAS, Royal Astronomical Society (UK), RAS, Russian Acoustical Society, RASS, Radio Acoustic Sounding System, RAST, Radio Allergo Sorbent Test, RASTI, Rapid Speech Transmission Index, RBOC, Regional Bell Operating Company, RBW, Resolution Bandwidth (Telekommunikation), RC, Routing Controller (Telekommunikation), R/C, Revenue/Cost Ratio, RCK, Research Centre Karlsruhe, RCL, Radio Communication Links, RCLED, Resonant Cavity Light Emitting Diode, RCMS, Remote Control and Monitoring System, RCP, Radio Control Part, RCP, Rapid Controller Prototyping, RCRA, Resource Conservation and Recovery Act (USA), RCSU, Remote Control and Status Unit, RD, Road (US Mail), R&D, Research and Development, RDC, Remote Digital Concentrator (Telekommunikation), RDF, Reverse Dispersion Fiber (optische Telekommunikation), RDS, Radio Data System (Europe), RDX, Trimethylentrinitramin (Hexogen, Sprengstoff), REA, Rauchgas-Entschwefelungs-Anlage, REACOL, Réseau Européen pour l'Assemblage par Collage, REC, Radiative Electron Capture, RECOVER, Remote Continual Verification (Atomenergie-Kontrolle), RED, Random Early Detection, REM, Rapid Eye Movement (Schlaf-Phase), REM, Rasterelektronenmikroskop, RERF, Radiation Effects Research Foundation (Japan), RES, Radio Equipment and Systems (TC im ETSI), RET, Resolution Enhancement Technology (HP-Laserdrucker), REU, Remote Control Electronic Unit, REWIMET, Regionales Windfeld-Modell einschließlich Transport (Wettervorhersage), REX, Realtime Executive (ein Betriebssystem), RF, Radio Frequency, RFA, Röntgenfluoreszenzanalyse, RFC, Request For Comment (Rechnernetz), RFD, Request For Discussion (Rechnernetz), RFID, Radio-Frequency Identification, RFPI, Radio Fixed Part Identity (DECT), RGA, Residual Gas Analyzer, RGB, Red-Green-Blue (TV), RGO, Reduced Gravity Office (NASA), RGS, Reflection Grating Spectrometer, RGS, Royal Geographic Society (London, 1830), RGW, Rat für gegenseitige Wirtschaftshilfe, RGW, Residential Gateway (Kommunikation), RGZM, Römisch-Germanisches Zentralmuseum, Forschungsinstitut für Vor- und Frühgeschichte (Mainz), RHEED, Reflection High Energy Electron Diffraction (Oberflächenanalyse, Elektronenoptik), RHIC, Relativistic Heavy Ion Collider (Brookhaven National Laboratory, USA), RI, Rhode Island (US-Staat), RIBE, Reactive Ion Beam Etching, RIE, Reactive Ion Etching, RIKEN, Institute of Physical and Chemical Research (Japan), RIMS, Resonance Ionization Mass Spectroscopy, RIN, Relative Intensity Noise, RIP, Requiescat in pace (Ruhe in Frieden), RIP, Routing Information Protocol (Internet), RIS, Resonance Ionization Spectroscopy, RISC, Reduced-Instruction-Set Computer, RISC, Research Institute for Symbolic Computation (Linz), RITA, Radio Frequency Ion Thruster Assembly, RITL, Radio in the Loop (Telekommunikation), RKA, Russian Space Agency , RKM, Rasterkraftmikroskop, RLL, Radio in the Local Loop (Telekommunikation), RLMS, Recursive Least Mean Square (Algorithmus), rlogin, remote login, RLR, Receive Loudness Rating (Telekommunikation), RLS, Recursive Least Square (Algorithmus), RM, Remote Manager (Telekommunikation), RM, Room (US Mail), RMC, RACE Management Committee, RMC-C, Central Remote Maintenance Centre, RMC-R, Regional Remote Maintenance Centre, RMI, Remote Method Invocation (Telekommunikation), RMON, Remote Monitoring, RMS, Resonant Macrosonic Synthesis, RMS, Root Mean Square, RMMS, Remote Maintenance and Monitoring System, RNA, Ribonucleic Acid, RNC, Radio and Network Controller (Telekommunikation), RNP, Radio Network Planning (Telekommunikation), RNRT, Réseau National de Recherche en Télécommunications (France Télécom), RNS, Ribonucleinsäure, R-OADM, Reconfigurable Optical ADM, ROI, Return On Instrument, ROL, Reverse Ocsillating Layer, ROM, Read Only Memory, ROSAT, (deutscher) Röntgensatellit, Roentgen Satellite (1990), ROSIS, Reflective Optics System Imaging Spectrometer, ROTEX, Roboter-Technologie-Experiment (Spacelab), ROV, Remotely Operated Vehicle, RPA, Random Phase Approximation, RPC, Remote Procedure Call, RPM, Radio Policy Matters (TC im ETSI), RPO, Rahmenprüfungsordnung, RPS, The Romanian Physical Society, RPWS, Radio and Plasma Wave Science (Instrument an Bord des Saturn-Satelliten Cassini), RR, radiative Rekombination, RR, Riva-Rocci (-Apparat zur Blutdruckmessung), RS, Raman Spectroscopy, RS-232, RS: Recommended Standard (EIA), RSA, Ronald Rivest, Adi Shamir, Leonard A. Adleman (asymmetrischer Kryptoalgorithmus, 1977), RSC, Radio Station, Central (Telekommunikation), RSCW, Radio Station Central Wireless (Telekommunikation), RSFQ, Rapid Single Flux Quantum Device, rsh, Remote Shell, RSM, Remote Station Nodal (Telekommunikation), RSSI, Receive Signal Strength Indication (DECT) (oder Radio ...), RST, Radio Station, Terminal (Telekommunikation), RST, Repeater Station, RST, Resonance Scattering Theory, RST, Running Status Table, RSTW, Radio Station Terminal Wireless (Telekommunikation), RSU, Remote Subscriber Unit (Telekommunikation), RSVP, Répond, s'il vout plaît (bitte antworten), RSVP, Ressource Reservation Protocol (Internet), RTAC, Real-Time Atmospheric Compensation (Adaptive Optik), RTAI, Real-Time Application Interface (Telekommunikation), RTCP, Real-Time Transport Control Protocol (Telekommunikation), RTD, Research and Technological Development (EC), RTD, Resistance Temperature Detector (z.B. Pt), RTD, Resonant Tunneling Device, RTD, Round-Trip Delay, RTE, Return From Exception, RTF, Rich Text Format, RTG, Radioisotope Thermoelectric Generator, RTI, Real-Time Interface, RTL, Raster Transfer Language (HP), RTL, Real-Time Linux, RTLinux, Real-Time Linux, RTM, Raster-Tunnelmikroskop(ie), RTM, Real Time Monitoring, RTO, Research and Technological Organization (EC), RTOS, Real-Time Operating System, RTP, Real-Time Transport Protocol (Telekommunikation), RTW, Real-Time Workshop, RU, Repeater Unit, RU, Resources Unit, RULLI, Remote Ultra-Low Light Imaging (Astrophysik), RUS, Rechenzentrum Universität Stuttgart, RV, Regionalverband (z. B. DPG), RVA, Richtlinienverabschiedungsausschuß (NALS), RVR, Runway Visual Range, RW, Ridge Waveguide, RWA, Receive Wavelength Adapter (Kommunikation), RWE, Rheinisch-Westfälische Elektrizitätswerke (?), RWI, Rheinisch-Westfälisches Institut für Wirtschaftsforschung (Essen), RWTH, Rheinisch-Westfälische Technische Hochschule (Aachen), RXTE, Rossi X-Ray Timing Explorer (Röntgensatellit), RZ, Return to Zero (Kommunikation), RZÜ, Rechnergestützte Zugüberwachung, S, SA, Selective Availability (Satellitennavigation), SAAI, Southern Africa Acoustics Institute, SAAL, Signaling ATM Adaptation Layer (Telekommunikation), SAARC, South Asian Association of Regional Cooperation, SAC, Strategic Air Command (USA), SACMOS, Self Aligned Contacts MOS, SAD, Spotless Activated Deposition (dünne Schichten), SADC, Southern Africa Development Cooperation, SAE, Society of Automotive Engineers (USA), SAFISY, Space Agency Forum on ISY, SAFTA, South Asian Free Trade Association, SAG, Selective Area Growth, SAGE, Soviet-American Gallium Experiment (Sonnen-Neutrinos, im Kaukasus), SAGM, Separate Absorption, Grading and Multiplication (APD), SALT, Southern African Large Telescope, SALT, Strategic Arms Limitation Treaty (oder: Talks), SAM, Scanning Acoustic Microscope, SAM, selbstaggregierende Monolagen, SAM, Separate Absorption and Multiplication (ADP), SAM, Speech Assessment Methodology, SAM, Spherical Aberration Management, SAMPE, Society for the Advancement of Material and Process Engineering, SAMPE, Society of Aerospace Material and Process Engineering, SAMPEX, Solar, Anomalous and Magnetospheric Particle Explorer (USA, Raumfahrt), SANA, Wissenschaftliches Begleitprogramm zur Sanierung der Atmosphäre über den neuen Bundesländern, SAP, Service Access Point (Internet), SAP, Symbolic Assembler Program (IBM 704, 1956), SAPAM, Society of African Physicists and Mathematicians, SAPPHIRE, Satellite and Aircraft Data Base Project for System Integrity Research (Satellitennavigation), SAPTA, South Asian Preference Trade Association, SAR, Second Assessment Report (IPCC, über globale Klimaveränderung, 1995), SAR, Specific Absorption Rate, SAR, Synthetic Aperture Radar, Synthetik-Apertur-Radar, SARA, Système Accélérateur Rhône-Alpes (Grenoble), SAS, Statistik-Server, SAS, Swedish Acoustical Society, Svenska Akustiska Sällskapet, SASE, Self-Amplified Spontaneous Emission, SAT, SIM Application Toolkit (Telekommunikation), SAVOIR, Sound and Vibration Organisation Information Resources (assocation formed in 1990, with support from the EG COMETT programme, located at ISVR, Southampton), SAW, Surface Acoustic Wave, SAXS, Small-Angle X-Ray Scattering, SB, Synchronization Burst (Telekommunikation), SBC, Single Board Computer, SBEC, Subband Echo Canceler, SBIR, Small Business Innovation Research (Program, USA), SBIRS, Space-Based Infrared System - Low Earth Orbit, SBL, Space Based Laser, SBP, Société Belge de Physique, SBR, Sustainable Bit Rate (Datentransfer), SBS, Save British Science (Lobby Group), SBSL, Single-Bubble Sonoluminescence, Einzelblasensonolumineszenz, SBTA, S-Band Test Accelerator, SBWAS, Space Based Wide Area Surveillance, SBZ, Sowjetische Besatzungszone, SC, South Carolina (US-Staat), SC, Switch-Capacitor (Filter), SCADA, Supervisory Control and Data Acquisition (Telekommunikation), SCAI, Fraunhofer- Institut für Algorithmen und Wissenschaftliches Rechnen (St. Augustin), SCALPEL, Scattering with Angular Limitation Projection Electron Beam Lithography, SCAMP, Service Control and Monitoring Prototype, SCAR, Scientific Committee on Arctic Research, SCAR, Supersonic Cruise Aircraft Research, SCASSS, Swedish Collegium for Advanced Study in the Social Sciences (Uppsala), SCBR, Silicon Chip Bragg Reflector (Laser), SCC, Satellite Control Center (Telekommunikation), SCCP, Signaling Connection and Control Part (oder: Point) (Telekommunikation), SCCR, Short-Circuit Current Response, SCE, Service Creation Environment (Telekommunikation), SCF, Self-Consistent Field, SCF, Service Control Function (Telekommunikation), SCF, La Sociedad