| Abbreviation | Definition |
|---|---|
| ARN | Application Receipt Number |
| ARN | Arabian Radio Network |
| ARN | Astronomical Research Network |
| ARN | Automotive Resource Network |
| ARNA | Aboriginal Republic of North America |
| ARNA | Afferent Renal Nerve Activity |
| ARNA | Alfa Romeo Nissan Automoveicoli |
| ARNA | Alfa Romeo Nissan Autoveicli |
| ARNA | Alfa Romeo Nissan Autoveicoli |
| ARNC | A R N C |
| ARNC | Active Road Noise Cancellation |
| ARNC | Alabama River Newsprint Company |
| ARNC | Alles ruikt naar chocola |
| ARNC | Association royale de numismatique du Canada |
| ARND | Alcohol Related Norepinephrine Deficiency |
| ARNI | Advanced ROS Network Introspection |
| ARNI | American Realty Network Inc |
| ARNI | Angiotensin Receptor Neprilysin Inhibitor |
| ARNIS | Advanced Rocket Nozzle Inspection System |
| ARNO | Arakan Rohingya National Organisation |