| Abbreviation | Definition |
|---|---|
| SIT | Subsidiary Integrity Token |
| SKA | Sallen- Key Architecture |
| SKA | Smart Keep Alive |
| SL | Schlage Link |
| SLA | Service Level Agreement |
| SLAAC | StateLess Address Auto Configuration |
| SLAN | Secure Local Area Network |
| SLC | Synchronous Link Control |
| SLD | Second Level Domain |
| SLE | Sponsored Link Exposures |
| SLP | Service Location Protocol |
| SLRRP | Simple Lightweight RFID Reader Protocol |
| SLS | Switch Level Simulator |
| SLT | Selective Laser Trabeculoplasty |
| SLT | Site Log Test |
| SLUG | Squid Log Usage Generator |
| SM | Session Management |
| SMB | Server Message Block |
| SMDI | Simplified Message Desk Interface |
| SMDS | Switched Multimegabit Data Service |