| GAS | Get-Away Special |
| VSOP | Very Special Old Programmer [like me] |
| SVP | Special Visibility Program |
| SIG | Special Interest Group |
| SAT | Special Access Termination |
| EV 1716 | Nowa Special Food Ibbenbüren, Nordrhein-Westfalen |
| NW-EZ 522 | Nowa Special Food Ibbenbüren, Nordrhein-Westfalen |
| SAC | Special Area Code |
| SIT | Special Information Tone |
| SOL | Special Object Library |
| SPNR | Special People Numbers Registry |
| MSDL | Motion Special Description Language |
| SLSF | System Lords Special Force Schweizer Gameclan |
| ISSN | Integrated Special Services Network |
| SIWG | Special Interest Working Group |
| SPES | Special Program for Employment of Students |
| SIGCAT | Special Interest Group on CD-ROM Applications and Technology |
| STAR | Special Telecommunication Action for Regional Development EU-Strukturhilfsprogramm |
| SIGPLAN | Special Interest Group on Programming Languages |
| ASCI | Areas of Special Conservation Interest [engl.] Flächen von besonderer Schutzwürdigkeit |
| BSIG | Bluetooth Special Interest Group [engl.] |
| SIGIR | Special Interest Group on Information Retrieval |
| CISPR | Comite International Special des Perturbations Radioelectriques |
| NASIG | Numerical Analysis Special Interest Group |
| IS | In Service |
| PCS | PC Service [OSF] |
| DOS | Denial Of Service |
| SL-EV 020 | Gourmet-Service Homburg, Saarland |
| HE 044 | DK Service Produktion Heppenheim, Hessen |
| COS | Class of Service |
| GOS | Grade Of Service |
| NSD | Name Service Daemon |
| MIPS | MaterialIntensität Pro Service |
| NSS | Name Service Switch |
| QoS | Quality of Service |
| TOS | Type Of Service |
| DS | Differentiated Service |
| ITOT | ISO Transport Service on top of TCP |
| SAC | Service Access |
| SP | Service Pack |
| IS | Integrated Service |
| SCS | SNA Communication Service |
| CL | Connectionless Service |
| TS | Telekom Service |
| SST | Self Service Terminal |
| ESS | Extended Service Set |
| VOTS | VAX OSI Transport Service |
| VDS | Virtual DMA Service |
| VAS | Value Added Service |
| TWS | Teletypewriter Service Fernschreibdienst |