| AAD | Automatic Activation Device |
|---|---|
| AAE | automatic answering equipment (skr.) |
| ABM | Automatic Building Machine |
| ABS | Automatic Backup System |
| ABS | Automatic Beam System |
| ABS | Automatic block signal (skr.) |
| ABS | Automatic Brightness Stabilization controller (skr.) |
| ABS | Automatic Brightness Stabilizer |
| ABT | Automatic Bus Transfer |
| AC | automatic computer (skr.) |