| Acronym | Definitions |
|---|---|
| ATGS | 1 |
| ATH | 3 |
| ATHENA | 2 |
| ATHS | 2 |
| ATI | 14 |
| ATIR | 3 |
| ATIS | 9 |
| ATK | 3 |
| ATL | 11 |
| ATLAS | 10 |
| ATLID | 1 |
| ATLS | 2 |
| ATM | 22 |
| atm. | 1 |
| ATMES | 2 |
| ATMI | 2 |
| ATMOS | 3 |
| ATMP | 2 |
| ATMS | 6 |
| ATN | 10 |
| ATO | 10 |
| ATOC | 3 |
| ATOD | 2 |
| ATOG | 2 |
| ATOMS | 2 |
| ATON | 1 |
| ATOS | 2 |
| ATOVS | 2 |
| ATP | 24 |
| ATPAC | 1 |
(2041 — 2070 of 2259)