| Abbreviation | Definition |
|---|---|
| ARMY | Arent Really Marines Yet |
| ARMY | Armed |
| ARMY | Arnt Really Marine Yet |
| ARMY | The Airforce Rejected Me Yesterday |
| ARN | Accident Reference Node |
| ARN | Acquired Reference Number |
| ARN | Acquirer Reference Number |
| ARN | Actions Réseaux Numériques |
| ARN | Actual Reference number |
| ARN | Acute Retinal Necrosis |
| ARN | Advanced Remote Node |
| ARN | Airport Revenue News |
| ARN | AjyaL Radio Network |
| ARN | Alien Registration Number |
| ARN | Amazon Resource Names |
| ARN | Amazon resource number |
| ARN | American Radio Network |
| ARN | American Roaming Network |
| ARN | Amfi Registration Number |
| ARN | Annenberg Radio News |