| AAB | Advertising Association of Baltimore |
|---|---|
| AACO | Arts and Culture Observatory (skr.) |
| AACO | Assault Airlift Control Officer |
| AACO | Australian Agricultural Company (skr.) |
| AAP | Alternate Access Provider |
| AAS | Aging and Adult Services |
| AAS | Air Assault School |
| AAS | Alternate Architecture Study |
| AAT | Army Assault Team |
| ABAK | časť hlavice antických stĺpov, počítadlo, stolík u oltára na prípravu bohoslužobných predmetov |