| AAC | Air Agency Certificate |
|---|---|
| AACO | American Association of Certified Orthoptists |
| AAS | Association d'Animations Scientifiques |
| AC | attribute certificate (skr.) |
| AC | authorization certificate (skr.) |
| ACI | Automatic Card Identification |
| AEN | Asynchronous Event Notification |
| AG | artificial gravity (skr.) |
| AGNOSKÁCIA | zisťovanie totožnosti osôb alebo vecí, uznanie niečoho, identifikácia |
| AIS | Universal Shipborne Automatics Identification System (skr.), univerzálny systém identifikácie lodí (angl.skr.) |