| A | actum (skr.) |
|---|---|
| AA | ad acta (skr.) |
| AACO | AIDS Activities Coordinating Office |
| AAD | Automatic Activation Device |
| AAP | Area Action Plan |
| AAR | Active Array Radar |
| ABB | Activity Based Benefits |
| ABC | Active Body Control |
| ABS | Action Battle System, typ fantasy bojového systému |
| ADC | Active Directory Connector |