| AAS | Astronomischer Arbeitskreis Salzkammergut |
|---|---|
| ABC | Australian Broadcasting Commission |
| ABM | anti-balistic missile (skr.), protibalistická raketa (angl.skr.) |
| ACC | American Chemistry Council |
| AEC | Atomic Energy Commision (skr.) |
| AED | Atomic Emission Detector |
| AEL | Accessible Emission Limit |
| AEM | Application Explorer Mission, tri americké družice určené na diaľkový prieskum Zeme |
| AKV | Annortotik Kvantev Vermisse (skr.) |
| ARI | Astronomisches Rechen-Institut |