AT
| Abbreviation | Meaning | Tamil Meaning | Category |
|---|---|---|---|
| AT | Attention | - | Human Genome |
| AT | Anti-Tank -Ashmore And Cartier Islands (FIPS 10-4 Territory Code) - Austria (ISO 3166 Digram) -Advanced Technology (IBM Personal Computer/AT) | - | Astronomy |
| AT | Astatine | - | Astronomy |
| AT | Attotesla | - | Astronomy |
| AT | IBM Advanced Technology Personal Computer | - | Business and Finance |
| AT | Abnormal Transient | - | Business and Finance |
| AT | Accelerator Technology | - | Business and Finance |
| AT | Antarctic Treaty | - | Business and Finance |