| Abbrev | Name | Spec | Type | Locality |
|---|---|---|---|---|
| TSL | TESSALAH-75[144][1281]; | TR.AE | DZA | |
| TST,1 | TEESTA[1281][1324]; | TR.AE | S | IND |
| TT | TOM-THUMB[144][1281]; | TR.AE | W | TIB |
| TTI | TRINTANI[145][1281]; | TR.AE | S | BRA |
| TTM | TITMOUSE[144][1281]; | TR.AE | MEX | |
| TTR | TEETER[114][144][1281]; | TR.AE | S | MEX |
| TUB | TUBENO[115][3692]; | TR.DR | S | MEX |
| TUC | TUCAN[114][144][1281]; | TR.AE | S | MEX |
| TUCM | TUCUMAN[144][1281] | TR.AE | S | ARG |
| TUCN | TUCANO[145]; | TR.AE | S | BRA |
| TUR,1 | TURCO[145]; | TR.AE | S | BRA |
| TW | TIMWIN[1281]; | TR.AE | W | USA |
| TZPC | TEZANOS-PINTO-CRIOLLO-MAG[145][1281]; | TR.AE | S | ARG |
| TZPP | TEZANOS-PINTOS-PRECOZ[39][144][145][1281]; | TR.AE | S | ARG |
| UC | UNICULM[1281]; | TR.AE | JPN | |
| ULC | ULUCAK-75[114][144][1281]; | TR.AE | TUR | |
| UM | UNIVERSITY-OF-MANITODA;UMTALI[1281]; | TR.AE | ZWE | |
| UP | UTTAR-PRADESH | TR.AE | S | |
| UP301 | UP-301[114][144][1281][1324]; | TR.AE | S | IND |
| UQ | URQUIE[1281]; | TR.AE | USA |