| Abbreviation | Definition |
|---|---|
| SWADL | Surface Acoustic Wave Delay Line |
| SWRD | Single Wire Return Device |
| SXB | Super EXtended Bus |
| SXD | Single Crystal Diffractometer |
| SXP | Sablotron XPath Processor |
| SXS | S-by-S (a flash memory standard) |
| SYN | SYNchronize |
| T | Transformer |
| T | vacuum Tube (circuit diagram marking) |
| T&B | Transmitter and Battery |
| TACACS | Terminal Access Control Access Control System |
| TACSIM | TACtical SIMulator |
| TAF | Transfer Audio and Files |
| TAM | Twentieth Anniversary MacIntosh |
| TAP | Test Access Port |
| TAP | Touch Activated Power |
| TASK | Tiny Application Sensor Kit |
| TASP | Towed-Array Signal Processor |
| TAT | Test And Trial |
| TAU | Terminal Adapter Unit |