| trg | SQL Script Triggers |
| tri | Cart3D Triangulation Data |
| tri | FreeSurfer Triangular Surface Data |
| tri | Greg Hood Binary Triangles Data |
| tri | Neuroscan Triangulated Surface Data |
| tri | Ribbons Triangle Definition |
| tria | Greg Hood ASCII Triangles Data |
| trib | Greg Hood Binary Triangles Data |
| tridefphoto | TriDef 3D Photo Transformer Depth Map |
| trie | Trie Data |
| trig | RDF Serialization Format Data |
| triggers | Debian Package Triggers Data |
| triple-s | Triple-S Survey Data |
| trix | RDF Triples in XML |
| trj | GROMACS Trajectory of a Simulation Data |
| trk | Concordance Transaction Tracking Data |
| trk | Garmin GPS PCX5 Tracklog |
| trk | MakeMusic Finale Track/Staff Mapping File |
| trk | STAR-CD v4 Droplet Track Data |
| trl | Holux GM-101 Tracklog |
| trl | Topocad Roadlines |
| trm | eSignal Trade Manager Data |
| trm8 | Avantes Avasoft v8 Transmittance Mode Data |
| trn | CFX Transient File |
| trn | MegaHAL Training Data |
| trn | Microsoft SQL Server Transaction Log |
| trn | Oracle Documaker Transaction Data |
| trn | PTC Creo Turning Parameter Data |
| trn | STN Express Transcript Text |
| tro | IBM Voice Type Data |
