| Subject | English | Thesaurus |
| abbr., telecom. | ACD system | automatic call distribution system |
| Nasdaq, abbr. | Affinity International Travel Systems | AFFT |
| st.exch., abbr. | American Computerized Commodity Exchange System And Services | ACCESS |
| invest., abbr. | Amex Options Switching System | AMOS |
| mil., abbr. | Army Data Services and Administration Systems Command | ADSC |
| abbr., post | Auto Dispatch System for Registered Mail | ASDRM |
| st.exch., abbr. | BEA Systems, Inc. options | VZP |
| mil., abbr. | Board of Directors, NATO Maintenance Supply Services System | BDNMSSS |
| st.exch., abbr. | Cabletron Systems, Inc. options | VIW |
| abbr., IT | CD File System | CDFS |
| abbr., comp., net. | CD-ROM File System | CDFS |
| mil., abbr. | Client Server Environment-System Services | CSE-SS |
| abbr., file.ext. | Common Management Information Services/System | CMIS |
| st.exch., abbr. | Computer-assisted Order Routing and Execution System for Options | CORESO |
| abbr., file.ext. | Cooperative Library Agency for Systems and Services | CLASS |
| abbr., post | Customer Services Management Data System | CSMDS |
| IT, abbr. | Dedicated Office Systems and Services | DOSS |
| USA | Defense Information Systems Network - Leading Edge Services | DISN-LES |
| IT, abbr. | Defense Message System Transition Working Group | DMSTWG (organization, DMS, Mil., USA) |
| USA | Directorate Of Information Systems And Services | DISS |
| abbr., progr. | enabling system services | enabling services (ssn) |
| abbr., post | Global Business System Dispatch | GBS-D (2007, part of GBS) |
| abbr., avia. | High Intensity Approach Lighting System | HIALS (Interex) |
| abbr., scottish | High Intensity Laser Missile Defence System | HILMDS |
| abbr. | Information Systems and Services | ISS (информационные системы и услуги Oleg Sollogub) |
| abbr. | Information Systems and Services | IS&S (информационные системы и услуги Oleg Sollogub) |
| abbr., commun. | Information Systems / Integrated Services | IS |
| USA | Inspection Services Information System | ISIS |
| abbr., astronaut. | Integrated Global Ocean Services System | IGOSS |
| IT, abbr. | Integrated Systems and Information Services | ISIS (OS, Intel) |
| abbr., file.ext. | Integrated Systems and Information Services | ISIS |
| abbr., scottish | Joint Services Imagery Exploitation System | JSIES (UK armed forces) |
| mil., abbr. | Joint Services Imagery Processing System | JSIPS |
| abbr., scottish | Joint Services Interior Intrusion Detection System | JSIIDS (USA) |
| abbr. | Laser Ablation Mask System | LAMS (Александр Рыжов) |
| abbr., commun. | Local Services Management System | LSMS |
| abbr., scottish | Low Intensity Conflict Aircraft System | LICAS |
| abbr. | Machine Readable Telegraphic Input Money Transfer System | MARTI (Vosoni) |
| ecol., abbr. | Marine Meteorological Services System | MMSS |
| aeron., abbr. | Maximum Intensity Approach Light System | MALS |
| abbr., scottish | Medium Intensity Approach Light System | MALS |
| transp., abbr. | Medium Intensity Approach Light System With Rail | MALSR |
| transp., abbr. | Medium Intensity Approach Light System With Sequenced Flashing Lights | MALSF |
| st.exch., abbr. | Mercury Computer Systems options | QYR |
| abbr., post | Mil International Dispatch & Accountability System | MIDAS |
| mil., abbr. | Military Health Services System | MHSS |
| account., abbr. | National Information Services And Systems | NISS |
| abbr. | National Information Services & Systems | NISS (ABelonogov) |
| st.exch., abbr. | Objective Systems Integrator options | UQJ |
| telecom., abbr. | Operator Services System | OSS |
| busin., abbr. | Options Automated Trading System | OATS |
| busin., abbr. | Options Margining System | OMS |
| st.exch., abbr. | OSI Systems, Inc. Options | UOJ |
| st.exch., abbr. | Pacific Options Exchange Trading System | POETS |
| abbr., file.ext. | Personal Communication Services/System | PCS |
| mil., abbr. | Protective Mask Fit Validation System | PMFVS |
| astronaut., abbr. | Radiation Intensity Meaning System | RIMS |
| IT, abbr. | Remote System Services Control Point | RSSCP (SSCP) |
| abbr., O&G, sahk.r. | SE Document Management System | SE DMS |
| abbr., scottish | Services Air Cargo System | SACS (UK) |
| abbr., scottish | Services Information Management System | SIMS |
| mil., abbr. | Services Systems Acquisition Review Council | SSARC |
| IT, abbr. | Set System Mask | SSM |
| abbr., telecom. | SPC system | stored-program control system |
| abbr., astronaut., mil. | System Acquisition Support Services | SASS |
| busin., abbr. | System Quality Services | SQS |
| progr. | system/service uptime monitor | service uptime monitor (ssn) |
| abbr., IT | System Services Control Point | SSCP |
| IT, abbr. | System Services Control Point | SSCP (NAU, SNA, SSCP) |
| telecom., abbr. | System Services Control Point | SSCP (SNA) |
| IT, abbr. | System Services Control Point Network Services | SSCPNS (SSCP) |
| comp., net., abbr. | System Services Interface | SSI |
| comp., net., abbr. | System Update Services | SUS |
| abbr., scottish | Systems Acquisition Support Services | SASS |
| abbr., comp., net. | Systems Network Architecture Distributed Services | SNADS |
| abbr., comp., net. | Systems Network Architecture/Management Services | SNA/MS |
| abbr., file.ext. | Systems Services and Technology | SST |
| NYSE., abbr. | Total System Services, Inc. | TSS |
| comp., abbr. | Unix System Services | USS |
| abbr. | User Services and Systems Support | USSS |
| comp., abbr. | Web Engineered Systems and Services | WESS |
| abbr., file.ext. | Windows Open Services/Systems Architecture | WOSA (Microsoft) |
| IT, abbr. | Xerox Network Services / Systems / Standard | XNS (Xerox, XNS) |
| abbr., office.equip. | Xerox Services for Unix Systems | XSUS (translator911) |
