| Acronym | Definition |
|---|
| ATST➣At the Same Time |
| ATST➣Advanced Technology Solar Telescope |
| ATST➣All the Small things (Blink-182 song) |
| ATST➣All Terrain Scout Transport (Star Wars) |
| ATST➣Aegon/Transamerica Series Trust (now Transamerica Series Trust; St. Petersburg, FL; investment management) |
| ATST➣AEGIS Technical Support Training |