| A DUE | pre dvoch (hud.) |
|---|---|
| AAB | Advertising Association of Baltimore |
| AAB | Airport Advisory Board |
| AAC | Academic Advisory Center |
| AAF | American Advertising Federation |
| AAM | Advertising Account Manager |
| AAS | Advances in the Astronautical Sciences |
| AAS | Airport Advisory Service |
| AAS | Arabian Advanced Systems |
| ABAKUS | abeceda v starom Egypte, u starých Rimanov ozdobný stolík, graficky znázornený vzťah dvoch alebo viacerých funkcií |