| Acronym | Meaning |
 | JN | Jan Mayen Island (FIPS 10-4 Territory Code) |
| ARM | Anti-Radiation Missile -Armenia (ISO 3166 Trigram) |
| OAC | On Approved Credit |
| RMA | Return Mailing Authorization - Revolution In Military Affairs |
| NCI | U.S. National Cancer Institute |
| RF | Radio Frequency - Receptive Field (neurophysiology) |
| RDDL | Resource Directory Description Language (riddle) |
| AYU | As Yet Unknown |
| DDOS | Distributed Denial Of Service |
| N | Nano |
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