| Symbol | Description | Uses |
| TANPHIATU_CONST | 1 | |
| TANPHIATU_FX | 1 | |
| TANPHIATU_FY | 1 | |
| TANPHIATV_CONST | 1 | |
| TANPHIATV_FX | 1 | |
| TANPHIATV_FY | 1 | |
| TARGET_AIX | 7 | |
| TARGET_BGL | 4 | |
| TARGET_CRAY_VECTOR | 8 | |
| TARGET_DEC | 2 | |
| TARGET_HP | 2 | |
| TARGET_LAM | 5 | |
| TARGET_NEC_SX | 79 | |
| TARGET_SGI | 7 | |
| TARGET_SUN | 2 | |
| TARGET_T3E | 6 | |
| THISDATE | 4 | |
| THISHOST | 4 | |
| THISUSER | 4 | |
| THISVER | 4 | |
| THSICE_FRACEN_POWERLAW | 6 | |
| TIME_PER_TIMESTEP | 6 | |
| TIME_PER_TIMESTEP_SFP | 2 | |
| TRY_NEW_GETPWHERE | 3 |