| Abbreviation | Definition |
|---|---|
| SIF | Source Input Format |
| SIF | Standard Interchange Format |
| SIFS | Short InterFrame Space |
| SIG | Special Interest Group |
| SIGCHI | Special Interest Group on Computer-Human Interaction |
| SIGTRS | Special Interest Group on Text Retrieval Systems |
| SIL | System Integration Laboratory |
| SILK | Scout In The Linux Kernel |
| SIM | Service Information Message |
| SIM | Simple Integer Machine |
| SIMA | Simple Integrated Media Access |
| SIMA | Support Initiative For Multimedia Applications |
| SIMILAR | Macro source file (MultiEdit) |
| SIMMS | Solutions In Managing Media Systems |
| SIMPL | Super Integrative Manipulative Programming Language |
| SIN | System Identification Number |
| SIO | Scalable Input/ Output Initiative |
| SIO | Serial Input/Output |
| SIP | Scilab Image Processing |
| SIP | Software Input Panel |