| Acronym | Meaning |
| NIU | Niue (ISO 3166 Trigram) |
| SDH | Synchronous Digital Hierarchy |
| KO | Korean Language (ISO 639-1 Code) |
| PAN | Panama (ISO 3166 Trigram) -Personal Area Network -PolyAcryloNitrile |
| KATUSA | Korean Augmentation To United States Army |
| FLK | Falkland Islands (ISO 3166 Trigram) -Funny-Looking Kid (medical Diagnosis In-joke) |
| FACS | Formal Aspects Of Computing Science - Fluorescent-activated Cell Sorting |
| NOSA | NATO OSI Security Architecture |
| MS | Megasecond |
| J5 | Joint Strategic Plans & Policy Directorate |