| AAS | Arabian Advanced Systems |
|---|---|
| ABC | Advanced Base Component |
| ABE | Advanced Boresight Equipment |
| ABI | Advanced Binary Interface (skr.) |
| ABI | Advanced Boundary Information |
| ABT | Advanced Backplane Technology |
| AC | Advanced Chemistry, nemecká rapová skupina |
| ACT | Advanced Computer Technology |
| ACTS | Advanced Crew Transportation System, spoločná štúdia pilotovanej kozmickej lode ESA a Ruska |
| ADC | Advanced Development Centers |