| Abbreviation | Definition |
|---|---|
| STIPS | Statewide Transportation Improvement Program STIP |
| STIR | Sustainable Transportation Initiative of Richmond |
| STISAC | Surface Transportation Information Sharing and Analysis Center |
| STK | Stick |
| STK | Stickey (quality of bottom on nautical charts) |
| STK | Stuck |
| STL | Lambert - St Louis International Airport |
| STLD | Surface Transport Loading Data |
| STM | Sea Traffic Management |
| STMF | Simple Transportation Management Framework |
| STMP | Simple Transportation Management Protocol |
| STMP | Special Traffic Management Program |
| STMP | Subregional Transportation Mitigation Program |
| STN | School Transportation News |
| STN | Smart Traffic Network |
| STN | Station |
| STO | Société de transport de l'Outaouais |
| STO | Special Touring Option |
| STOA | State Transit Operating Assistance |
| STOL | Short Take-Off and Landing |