| Subject | English | Thesaurus |
| abbr., scottish | Acoustic Charged Transport Electronic Warfare, low-cost decoy system | ACTEW |
| abbr., IT | Advanced Text Management System | ATMS |
| abbr., law | Adversary system | accusatory system |
| abbr., energ.ind. | Automated Meter Reading System | AMRS (MichaelBurov) |
| abbr., scottish | Automated Military Justice Analysis & Management System | AMJAMS (USA) |
| mil., abbr. | Automated Text Message Handling System | ATMHS |
| abbr., IT | "bake something in" means to incorporate something as an integral part of a product, service, or system. | bake in (dron1) |
| transp., abbr. | Bangkok Transport System | BTS |
| IT, abbr. | Base Station System Management Application Part | BSSMAP (RR, BS, MTP, GSM, Mobile-Systems) |
| abbr., file.ext. | Bulletin Board System announcement or text information | BBS |
| abbr., commun. | Cable Modem Termination System | CMTS |
| abbr. | Canards Actuator System Army, artillery | CAS (Alex Lilo) |
| mil., abbr. | Combat Information Transport System | CITS |
| abbr., scottish | Common Termination System | CTS |
| abbr., logist. | Computerized Automatic Part Searching System | CAPS (Mitsubishi Motors Co. gorbulenko) |
| abbr., file.ext. | Constituent Electronic Mail System | CEMS |
| transp. | container transport system | CTS (MichaelBurov) |
| nucl.pow. | control and protection system actuator | CPS actuator (MichaelBurov) |
| transp. | cooperative systems for road transport | eSafety |
| meteorol., abbr. | Course-Glide Path Landing System | CGSP |
| univer., abbr. | Credit Accumulation And Transfer System | CATS |
| account., abbr. | Credit Management System | CMS |
| abbr., IT | DB/DC System | Data Base/Data Communications System |
| USA | Disaster Credit Management System | DCMS |
| abbr. | driverless transport system | automatic guided vehicle system (ssn) |
| ocean., abbr. | Earthquake Phenomena Observation System | EPOS |
| abbr., law | European Credit Transfer System | ECTS (Leonid Dzhepko) |
| ed., abbr. | European Credits Transfer System | ECTS |
| abbr., scottish | Expendables System Programmer | ESP |
| abbr., textile | FAST system | Fabric Assurance by Simple Testing system |
| invest., abbr. | Federal Farm Credit System | FFCS |
| abbr. | Financial Automated System of Information Transport | FASIT (Johnny Bravo) |
| IT, abbr. | Flexible Image Transport System | FITS (Space) |
| abbr., astronaut. | Flexible Image Transport System | FITS |
| abbr., file.ext. | Flexible Image Transport System Graphics and data | FIT |
| abbr., file.ext. | Flexible Image Transport System Graphics and data | FITS |
| comp., abbr. | Flexible Images Transport System | FITS |
| abbr., scottish | Flight Termination Ordnance System | FTOS |
| abbr. | For Future Inland Transport Systems | ForFITS (KB84) |
| ocean., abbr. | General Work Force Performance Appraisal System | GWPAS |
| tradem., abbr. | Gordon's Transport System | GTS |
| busin., abbr. | High Performance Work System | HPWS |
| auto. | Idle Stop System | ISS (iwona) |
| abbr., scottish | Integrated Data Transport System | IDTS |
| busin., abbr. | Intelligent Work System | IWS |
| abbr. | International Air Transport System | IATA |
| abbr., scottish | Lockheed Martin Alenia Tactical Transport Systems | LMATTS |
| abbr., post | Mail Processing Work Credit System | MPWCS |
| abbr., post | Mail Transport Equipment Labeling System | MTEL (2004 "license plates" for surface visibility initiative) |
| abbr., post | Mail Transport Equipment Support System | MTESS (software, redesigned 2003) |
| IT, abbr. | Media Orientated Systems Transport | MOST |
| comp., net., abbr. | Media Oriented Systems Transport | MOST |
| abbr., scottish | Message Orientated Text Interchange System | MOTIS |
| abbr., astronaut., mil. | Message Transport System | MTS (Internet) |
| IT, abbr. | Message-Orientated Text Interchange System | MOTIS (ISO 10021, JTC1) |
| abbr., comp., net. | Message-Oriented Text Interchange System | MOTIS |
| comp., abbr. | Message-Oriented Text Interchange Systems | MOTIS |
| bot., abbr. | Moisture Transport System | MTS |
| transp., abbr. | Monitor Transport Strapping System | MTSS |
| IT, abbr. | Operating System Work Station | OSWS |
| abbr., post | Optical Mark Reader System | OMRS |
| meteorol., abbr. | Optimum Path Aircraft Routing System | OPARS |
| abbr., O&G, sahk.r. | Permit To Work system | PTW |
| abbr., scottish | Programmer's Hierarchical Interactive Graphics System | PHIGS |
| abbr. | Programmers Hierarchical Interactive Graphics System | PHIGS |
| abbr., astronaut. | Prospective Piloted Transport System | PPTS (MichaelBurov) |
| ed., abbr. | Reading Motivation System | RMS |
| abbr., astronaut., mil. | Remote Unmanned Work System | RUWS |
| abbr., leath. | RF system | reduce formaldehyde system |
| abbr., tech. | Shuttle Program Information Management System | SPIMS (Vosoni) |
| tech., abbr. | shuttle system | ss |
| comp., abbr. | Special Interest Group on Text Retrieval Systems | SIGTRS |
| comp., abbr. | Speed Pad System | SPS |
| transp. | Speedway Transport System | "Speedway Transport System" |
| el., abbr. | Strategic Material Transport System | SMTS |
| IT, abbr. | Synchronous Transport System - level 3 Concatenated | STS-3c (SDH) |
| mil., abbr. | System High Water Mark | SHWM |
| telecom., abbr. | System Management Application Part | SMAP |
| busin. | System of Professional Analysis of Markets and Firms | SPARK (MichaelBurov) |
| abbr., scottish | Technique for Reading an Integrated Air Defence System | TRIADS |
| comp., abbr. | Text Adventure Design System | TADS |
| sport., abbr. | Text Adventure Development System | TADS |
| mil., abbr. | Text and Image Information Management System | TIIMS |
| abbr., file.ext. | Text Information Management Systems | TIMS |
| abbr., scottish | Text & Office Systems | TOS |
| abbr. | Text ORiented Editing System | TORES |
| transp., abbr. | Transport Innovation And Systems | TIS |
| abbr., astronaut., mil. | Transport Management System | TMS |
| telecom., abbr. | Transport System Generic Requirements | TSGR |
| abbr. | Transport Technological System | TTS (Yuriy83) |
| abbr., ed. | United States Credit System | USCS (Johnny Bravo) |
| abbr., post | Universal Transport System | UTS (2004, expanded version of Tray Management System) |
| NASA, abbr. | Unmanned Work Vehicle System | UMV |
| abbr., scottish | Utility Tactical Transport Aircraft System | UTTAS (USA) |
| mil., abbr. | Utility Tactical Transport Aircraft System | UTTAS |
| abbr., scottish | Warehouse & Transport Management System | WTMS (UK Royal Air Force) |
| busin., abbr. | Web Work Request System | WWRS |
| softw., abbr. | Web-based Drawing Viewer System | WDVS |
| med. | Whole of Systems Trial of Prevention Strategies for Childhood Obesity | WHOSTOPS (bigmaxus) |
| tech., abbr. | Work Action Management System | WAMS |
| busin., abbr. | Work Centered Support System | WCSS |
| USA | Work Force Information System | WFIS |
| busin., abbr. | Work Group Support Systems | WGSS |
| abbr., file.ext. | Work Group System | WGS |
| comp., abbr. | Work Information System | WIS |
| humor., abbr. | Work Is Never Done On a Windows System | WINDOWS |
| busin., abbr. | Work Zone Analysis System | WZAS |
| abbr., inet. | Xerox Network Systems' Internet Transport Protocol | XNS/ITP |