| Abbreviation | Definition |
|---|---|
| SWT | Standard Widget Toolkit |
| SYN | SYNchronous |
| SYS | System |
| SYSOP | System Operator |
| SZO | Soft Zone Output |
| T | Templates |
| T | Trouble |
| t.o | timed out |
| TA | Technical Assistance |
| TA | Test Account |
| TA | Timing Advance |
| TA | Transactional Analysis |
| TAAI | Taiwanese Association for Artificial Intelligence |
| TAAS | ACM Transactions on Autonomous and Adaptive Systems |
| TAB | go to next TAB stop |
| TAB | IEEE Technical Activities Board |
| TAC | Technical Assistance Coordinator |
| TAC | This Ain't Controls |
| TACC | Transformation, Aggregation, Caching, and Customization |
| TADS | Text Adventure Design System |