| AAU | Amateur Athletic Union (skr.) |
|---|---|
| AC | Australian companion (skr.), hodnosť v ráde Order of Australia |
| ACU | American Church Union |
| ACU | Asian Clearing Union (skr.) |
| ANEX | anionit, vymieňač aniónov |
| ANION | anión, po česky |
| ANIONIT | anex, vymieňač aniónov |
| ARU | Australian Rugby Union (skr.) |
| ARU | skr. american railway union |
| ASU | American Students Union (skr.) |