| Acronym | Sense | Language | Topics |
|---|---|---|---|
| RSR | Release Schedule Record | In English | → Records management |
| RSRA | Rotor System Research Aircraft | In English | → Aeronautics, aircraft |
| RSRB | Redesigned Solid Rocket Booster | In English | → Astronautics |
| RSRM | Redesigned Solid Rocket Motor | In English | → Astronautics |
| RSS | Residual Sum of Squares | In English | → Mathematics |
| RSS | RDF Site Summary | In English | → Networks, communication |
| RSS | Really Simple Syndication | In English | → Networks, communication |
| RSS | Rural Sociological Society | In English | → Organizations and associations → Sociology |
| RSS | Recombination Signal Sequences | In English | → Genetics → Biochemistry, biophysics |
| RSS | Rashtriya Swayamsevak Sangh = RSS | राष्ट्रीय स्वयंसेवक संघ | In Hindi |
In English | → Political parties and movements |
| RSS | Range Safety Switch | In English | → Accidents, risks, safety |
| RSS | Range Safety System | In English | → Accidents, risks, safety |
| RSS | Reactant Supply System | In English | → Vehicle engineering |
| RSS | Restart Selectover System | In English | |
| RSS | Rib Structure Station | In English | |
| RSS | Root Sum Square | In English | → Mathematics |
| RSS | Rotating Service Structure | In English | |
| RSS | Recombination Signal Sequence | In English | → Biochemistry, biophysics |
| RSSPO | Resident Space Shuttle Project Office | In English | → Astronautics |
| RST | Recessed Selectomatic Terminal | In English | → Human-computer interaction |
| RST | ReStructuredText | In English | → Document processing |
| RSTEd | Research in Science and Technological Education | In English | → Serial publications, periodicals → Education |
| RSTP | Rapid Spanning Tree Protocol | In English | → Networks, communication → Telecommunications |
| RSTS | Resource Sharing Time Sharing System | In English | → Operating systems |
| RSTS/E | Resource Sharing Timesharing System Extended | In English | → Software |
| RSU | Remote Service Unit | In English | → Networks, communication |
| RSV | Ready Storage Vessel | In English | |
| RSV | Respiratory Syncytial Virus = VRS | Virus Respiratoire Syncytial | In French |
In English | → Virology → Infectious diseases |
| RSW | RFID, Sensors and Wireless | In English | → Electronics → Telecommunications |
| RT | Reverse Transcriptase | In English | → Genetics → Enzymes |
| RT | Railway Telecommunications | In English | → Telecommunications → Rail transport engineering → Transport and postal services |
| RT | Reverse Transcription | In English | → Genetics |
| RT | Real Time | In English | → Computer science |
| RT | Reference Trajectory | In English | → Aeronautics, aircraft → Astronautics |
| RT-PCR | Reverse Transcriptase Polymerase Chain Reaction | In English | → Biotechnology → Genetics → Enzymes |
| RT/LO | Receiver Transmitter/Local Oscillator | In English | → Telecommunications |
| RTAC | Research and Technology Advisory Committee | In English | → Organizations and associations → Research policy → Engineering, technology |
| RTAMS | Representation Theory of the American Mathematical Society | In English | → Serial publications, periodicals → Mathematics → United States |
| RTAW | Rockwell Tandem Arc Weld | In English | → Metallurgy |
| RTB | Resistance Temperature Bulb | In English | |
| RTB | Radio Television Belgrade | In English | → Telecommunications |
| RTC | Real-Time Clock | In English | → Computer science → Horology |
| RTC | Real-Time Command | In English | |
| RTC | Real-Time Computer | In English | → Computer hardware |
| RTC | Room-Temperature Cure | In English | |
| RTC | Remedial Teaching Center | In English | → Organizations and associations → Education |
| RTCA | Radio Technical Commission for Aeronautics | In English | → Organizations and associations → Telecommunications → Aeronautics, aircraft |
| RTCC | Real-Time Computer Center | In English | → Computer hardware |
| RTCC | Real-Time Command Controller | In English | |
| RTCC | Real-Time Computer Command | In English | → Computer hardware |
| RTCC | Real-Time Computer Complex | In English | → Computer hardware |
| RTCE | Rotation/Translation Control Electronics | In English | → Electronics |
| RTCP | Real-Time Communications Processor | In English | → Computer hardware → Telecommunications |
| RTCPS | Real-Time Computer Program System | In English | → Computer programs |
| RTCS | Real-Time Computer System | In English | → Computer hardware → Software |
| RTD | Research, Technology and Development | In English | → Research policy → Engineering, technology |
| RTD | Real-Time Data | In English | → Data |
| RTD | Real-Time Display | In English | → Human-computer interaction |
| RTD | Resistance Temperature Device | In English | |
| RTD | Resistance Thermal Device | In English | |
| RTDD | Release To Design Development | In English | |
| RTE | Responsible Test Engineer | In English | → Engineering, technology |
| RTF | Rich Text Format | In English | → Data |
| RTF | Return To Flight | In English | → Aeronautics, aircraft → Astronautics |
| RTFM | Read The Fucking Manual | In English | |
| RTFSS | Real-Time Flight Safety Software | In English | → Software → Accidents, risks, safety → Aeronautics, aircraft → Astronautics |
| RTG | Radioisotope Thermal Generator | In English | → Energy economics → Nuclear technology |
| RTG | Radioisotope Thermoelectric Generator | In English | |
| RTHC | Rotational-Translational Hand Controller | In English | |
| RTHS | Real-Time Hybrid System | In English | |
| RTIF | Real-Time Interface | In English | → Human-computer interaction |
| RTK | Receptor Tyrosine Kinase | In English | → Enzymes |
| RTL | Register Transfer Level | In English | → Computer hardware |
| RTLS | Return To Launch Site | In English | → Aeronautics, aircraft → Astronautics |
| RTM | Release To Manufacturing | In English | |
| RTM | Robot Task Measurement | In English | |
| RTN | Research Training Network | In English | → Education → Research policy |
| RTN | Recursive Transition Network | In English | → Linguistics |
| RTO | Rapid Turn-On | In English | |
| RTOLAP | Real-Time On Line Analytical Processing | In English | → Knowledge management → Data |
| RTOP | Research and Technology Objectives and Plans | In English | → Research policy → Engineering, technology |
| RTOP | Research and Technology Operating Plan | In English | → Research policy → Engineering, technology |
| RTOS | Real-Time Operating System | In English | → Operating systems |
| RTP | Research Trends in Physics | In English | → Serial publications, periodicals → Physics |
| RTPM | Real-Time Program Management | In English | → Management |
| RTRL | Real-Time Recurrent Learning | In English | → Artificial intelligence |
| RTRL | Richmond-Tweed Regional Library (www.rtrl.nsw.gov.au) | In English | → Libraries |
| RTRL | Run The Red Light | In English | |
| RTS | Range Tracking Station | In English | |
| RTS | Real-Time Subsystem | In English | |
| RTS | Real-Time Supply | In English | |
| RTS | Reliability Test Specimen | In English | |
| RTS | Remote Tracking Station | In English | |
| RTS | Real-Time Strategy = STR | Stratégie en Temps Réél | In French |
In English | → Computer science → Entertainment |
| RTS | Run Time System | In English | → Software |
| RTSF | Real-Time Simulation Facility | In English | → Computer simulation |
| RTSS | Real-Time Simulation System | In English | → Computer simulation |
| RTSS | Resource Time Sharing System | In English | → Software |
| RTT | Round Trip Time | In English | → Networks, communication |
| RTT | Romania Think Tank | In English | → Organizations and associations → Politics → Romania |
| RTTV | Real-Time Television | In English | → Telecommunications |
| RTU | Remote Terminal Unit | In English | → Human-computer interaction |
| RTV | Room-Temperature Vulcanizing | In English | |
| RTVM | Requirements and Test Verification Matrix | In English | |
| RU | Remote Unit | In English | |
| RU | Rack Unit | In English | → Computer science |
| RUBISCO | Ribulose Bisphosphate Carboxylase/Oxygenase | In English | → Enzymes |
| RUCTA | Research Unit on Cultures and Technologies in Asia | In English | → Research institutes |
| RUF | Rapid Urban Flexible | In English | → Vehicle engineering |
| RUIM | Removable User Identity Module | In English | → Telecommunications |
| RuleML | Rule Markup Language | In English | → Programming languages |
| RUPA | Rugby Union Players' Association | In English | → Associations → Football and rugby |
| RuPhJ | Russian Physics Journal | In English | → Serial publications, periodicals → Physics → Russia |
| RUSHES | Retrieval of mUltimedia Semantic units for enHanced rEuSability | In English | → Computer-based techniques |
| RV | Recirculation Valve | In English | |
| RV | Recovery Vehicle | In English | → Vehicle engineering |
| RV | Reentry Vehicle | In English | → Astronautics |
| RV | Relief Valve | In English | |
| RVAO | Reentry Vehicle Associated Object | In English | → Astronautics |
| RvAqS | Reviews in Aquatic Sciences | In English | → Serial publications, periodicals → Marine research, oceanography → Hydrology |
| RVAS | Requirements Verification and Accounting System | In English | → Accounting |
| RVCF | Remote Vehicle Checkout Facility | In English | → Vehicle engineering |
| RVCN | Requirement Verification Completion Notice | In English | |
| RVDT | Rotary Variable Differential Transducer | In English | |
| RVDT | Rotary Variable Differential Transformer | In English | |
| RvE&S | The Review of Economics and Statistics | In English | → Serial publications, periodicals → Statistics → Economics |
| RvES | The Review of Economic Studies | In English | → Serial publications, periodicals → Economics |
| RvGeo | Reviews of Geophysics | In English | → Serial publications, periodicals → Geophysics |
| RvGeS | Reviews of Geophysics Supplement | In English | → Serial publications, periodicals → Geophysics |
| RvGSP | Reviews of Geophysics and Space Physics | In English | → Serial publications, periodicals → Geophysics → Astronomy |
| RvMA | Reviews in Modern Astronomy | In English | → Serial publications, periodicals → Astronomy |
| RvMaP | Reviews in Mathematical Physics | In English | → Serial publications, periodicals → Mathematics → Physics |
| RvMin | Reviews of Mineralogy | In English | → Serial publications, periodicals → Mineralogy |
| RvMP | Reviews of Modern Physics | In English | → Serial publications, periodicals → Physics |
| RvMPS | Reviews of Modern Physics Supplement | In English | → Serial publications, periodicals → Physics |
| RVN | Requirements Verification Network | In English | |
| RvOp | Reviews of Optics | In English | → Serial publications, periodicals → Optics |
| RvPCJ | Review of Physical Chemistry of Japan | In English | → Serial publications, periodicals → Physical chemistry |
| RvPP | Reviews of Plasma Physics | In English | → Serial publications, periodicals → Plasma physics |
| RvPT | Review of Physics in Technology | In English | → Serial publications, periodicals → Physics → Engineering, technology |
| RVR | Requirement Verification Revision | In English | |
| RVR | Runway Visual Range | In English | |
| RVRS | Requirements Verification Review Sheet | In English | |
| RW | Reaction Wheel | In English | |
| RWDM | Racing White Daring Molenbeek | In English | → Organizations and associations → Football and rugby |
| RWE | Read/Write Electronics | In English | → Electronics |
| RWM | Read and Write Memory | In English | → Memories |
| RWS-CC | Regional Workshop Coordinating Committee | In English | |
| RXTE | Rossi X-Ray Timing Explorer | In English | |
| RYD | Real-Year Dollars | In English | |
| RyeGI | Rye Gene Index | In English | → Genetics → Biotechnology |
| S | Serine = S | سيرين | In Arabic = S | Serina | In Catalan = S | Serin | In Czech = S | Serin | In Danish = S | Serin | In German = S | Serina | In Spanish = S | Serino | In Esperanto = S | Sérine | In French = S | 세린 | In Korean = S | Serin | In Croatian = S | Serin | In Indonesian = S | Serina | In Italian = S | סרין | In Hebrew = S | Serīns | In Latvian = S | Serin | In Letzeburgesh = S | Serinas | In Lithuanian = S | Serine | In Dutch = S | セリン | In Japanese = S | Serin | In Norwegian = S | Seryna | In Polish = S | Serina | In Portuguese = S | Серин | In Russian = S | Seriini | In Finnish = S | Serin | In Swedish = S | செர்ரீன் | In Tamil = S | Serin | In Turkish = S | Серин | In Ukrainian = S | 絲氨酸 | In Chinese |
In English | → Biochemistry, biophysics |
| S | Sulfur = S | Soufre | In French = S | Swawel | In Afrikaans = S | كبريت | In Arabic = S | Azufre | In Asturian = S | Kükürd | In Azerbaijani = S | Сера | In Belarusian = S | Сяра | In Bulgarian = S | গন্ধক | In Bengali = S | Sumpor | In Bosnian = S | Sofre | In Catalan = S | Zolfu | In Corsican = S | Síra | In Czech = S | Sylffwr | In Welsh = S | Svovl | In Danish = S | Schwefel | In German = S | Θείο | In Greek = S | Sulfuro | In Esperanto = S | Azufre | In Spanish = S | Väävel | In Estonian = S | Sufre | In Basque = S | گوگرد | In Persian = S | Rikki | In Finnish = S | Solfar | In Friulian = S | Xofre | In Galician = S | גופרית | In Hebrew = S | गन्धक | In Hindi = S | Sumpor | In Croatian = S | Souf | In Haitian Creole = S | Kén | In Hungarian = S | Ծծումբ | In Armenian = S | Belerang | In Indonesian = S | Sulfo | In Ido = S | Brennisteinn | In Icelandic = S | Zolfo | In Italian = S | 硫黄 | In Japanese = S | 황 | In Korean = S | Kibrît | In Kurdish = S | Schwiefel | In Letzeburgesh = S | Solfer | In Limburgish = S | Siera | In Lithuanian = S | Sērs | In Latvian = S | Pungatara | In Māori = S | Сулфур | In Macedonian = S | ഗന്ധകം | In Malayalam = S | Хүхэр | In Mongolian = S | सल्फर | In Marathi = S | Swevel | In Low German = S | Zwavel | In Dutch = S | Svovel | In Nynorsk = S | Svovel | In Norwegian = S | Sulfre | NOV = S | Sofre | In Occitan = S | Siarka | In Polish = S | Enxofre | In Portuguese = S | Salina | In Quechua = S | Sulf | In Romanian = S | Сера | In Russian = S | Surfi | In Sicilian = S | Sumpor | In Serbo-Croatian = S | Síra | In Slovak = S | Žveplo | In Slovenian = S | Squfuri | In Albanian = S | Сумпор | In Serbian = S | Walirang | In Sundanese = S | Svavel | In Swedish = S | Sulfuri | In Swahili = S | கந்தகம் | In Tamil = S | గంధకము | In Telugu = S | กำมะถัน | In Thai = S | Kükürt | In Turkish = S | Сірка | In Ukrainian = S | Oltingugurt | In Uzbek = S | Lưu huỳnh | In Vietnamese = S | שװעבל | In Yiddisch = S | 硫 | In Chinese |
In English | → Chemistry |
| S&A | Science and Application | In English | → Mathematics and natural sciences → Applied sciences, technology |
| S&AD | Science and Applications Directorate | In English | → Mathematics and natural sciences → Applied sciences, technology |
| S&C | Stabilization and Control | In English | |
| S&E | Science and Engineering | In English | → Mathematics and natural sciences → Engineering, technology |
| S&E | Sensors and Effectors | In English | |
| S&MST | Space and Missile System Test | In English | → Military engineering → Astronautics |
| S&P | Standard & Poor's | In English | → Finance |
| S&PA | Safety and Product Assurance | In English | → Accidents, risks, safety |
| S&SED | Satellite and Space Electronics Division | In English | → Electronics → Astronautics |
| S&T | Science and Technology = CyT | Ciencia y Tecnología | In Spanish = S&T | Sciences et Technologie | In French = C&T | Ciência e Tecnologia | In Portuguese |
In English | → Mathematics and natural sciences → Engineering, technology |
| S&T | Sky and Telescope | In English | → Serial publications, periodicals → Astronomy |
| S&TI | Scientific and Technical Intelligence | In English | → Knowledge management |
| S2S^2 | Sound to Sense, Sense to Sound | In English | → Computer-based techniques |
| S3 | Sortie Support System | In English | |
| S3 | Simple Storage Service | In English | → Data |
| S3 | Amazon Simple Storage Service | In English | → Computer hardware → Internet → Data |
| SA | Semen Analysis | In English | → Reproductive biology |
| SA | Supplemental Agreement | In English | |
| SA | Support Area | In English | |
| SA | Swing Arm | In English | |
| SA | Selective Availability | In English | |
| SA | Shaft Angle | In English | |
| SA | Shop Aid | In English | |
| SA | Signature Analysis | In English | |
| SA | Single Access | In English | |
| SA | Site Activation | In English | |
| SA | Solar Array | In English | |
| SA | Spectrum Analyzer | In English | |
| SA | Space Accounting | In English | → Accounting |
| SA | Student Association | In English | → Associations → Higher education, universities |
| SA&I | Systems Analysis and Integration | In English | |
| SAA | Single Access Antenna | In English | |
| SAA | Severe Aplastic Anemia | In English | → Pathology → Blood and circulatory system |
| SAA | South Atlantic Anomaly | In English | → Meteorology, climatology |
| SAA | Stochastic Analysis and Applications | In English | → Serial publications, periodicals → Mathematics |
| SAA | Semantic Audio Analysis | In English | → Computer-based techniques → Linguistics |
| SAAG | South Asia Analysis Group | In English | → Area studies |
| SAALC | San Antonio Air Logistics Center | In English | → Maintenance and logistics → Aeronautics, aircraft |
| SAALG | South Asia Archive & Library Group | In English | → Libraries → Area studies |
| SAAM | Surface-Air Anti-Missile | In English | → Military engineering |
| SAANZ | Sociological Association of Aotearoa/New Zealand | In English | → Associations → Sociology |
| SAAOC | South African Astronomical Observatory Circular | In English | → Serial publications, periodicals → Astronomy → Africa |
| SAAOR | South African Astronomical Observatory, Republic of South Africa | In English | → Serial publications, periodicals → Astronomy → Africa |
| SAARC | South Asian Association for Regional Co-operation | In English | → Associations → International relations |
| SAARC | South Asian Association for Regional Cooperation (www.saarc-sec.org) | In English | → Organizations and associations → International relations |
| SaaS | Software as a Service | In English | → Software → Networks, communication |
| SAAS | Shuttle Aerospace Actuator Simulator | In English | → Aeronautics, aircraft → Astronautics |