| Abbreviation | Definition |
|---|---|
| NU | New Uniform |
| NUA | No Unlimited Ammo |
| NUAC | Nordic Upper Airspace Centre |
| NUAS | Northumbrian Universities Air Squadron |
| NUC | Naval Unit Citation |
| NUC | Non-Unit-Related Cargo |
| NUC | Nuclear |
| NUCINT | Nuclear Intelligence |
| NUD | Naval Underwater Detection |
| NUDET | Nuclear Detonation |
| NUDETS | Nuclear Detonation Detection and Reporting System |
| NUF | Network Underground Facility |
| NUF | Nuclear Fallout |
| NUFEA | Navy-Unique Fleet Essential Aircraft |
| NUG | New Users Guide |
| NUKE | Explode a nuclear weapon over something |
| NUMB | Nuclear Urban Migraine Blaster |
| NUP | Non-Unit-Related Personnel |
| NURADS | Netted Universal Radar System |
| NURC | Non-Unit Related Cargo |