| Abbreviation | Definition |
|---|---|
| ARC | Advanced Reconnaissance Clone |
| ARGUS | Advanced Research Group Uniting Super-Humans |
| ARK | Advisors Of Rubi Ka |
| ARNE | Anthropomorphic Robot of New Era |
| ARSM | Almighty RS Mafia |
| ART | Alien Rejection Therapy |
| ART | Appearance, Reality, and Theory |
| ARV | Alien Reproduction Vehicle |
| ASE | Alpha Squadron Elite |
| ASF | Assassination Special Forces |
| ASH | Alliance Super Heroes |
| ASMR | A Sailor Moon Romance |
| ASOIAF | A Song Of Ice And Fire |
| ATACT | All-Terrain Armored Cargo Transport |
| ATARI | Advanced Technology And Research Institute |
| ATM | Alien Time Machine |
| ATM | Alien Training Module |
| ATM | Automated Teleportation Module |
| AT-RT | All Terrain Recon Transport |
| AT-ST | All Terrain Scout Transport |