| Abbreviation | Definition |
|---|---|
| SYM | Symmetric |
| SYM | Symptoms |
| SYOA | Single Year Of Age |
| SYR | Syrup |
| SYR | Syrynge |
| SYS | System |
| SYS | Systolic |
| SYT | Sonic Youth Therapy |
| SZP | Superficial Zone Protein |
| T | Tired |
| T&R | Tenderness and rebound |
| T.NEUT | Hematology |
| T-1 | 1st Thoracic Vertebrae |
| T1D | Type 1 Diabetes |
| T-2 | 2nd Thoracic Vertebrae |
| TA | Tenth Amphetamine |
| TA | Traffic Accident |
| TAA | ThoracoAbdominal Aorta |
| TAAA | ThoracoAbdominal Aortic Aneurysm |
| TAAAR | ThoracoAbdominal Aortic Aneurysm Repair |