| Acronym | Meaning |
| UN | United Nations |
| IRBM | Intermediate Range Ballistic Missile |
| MTM | Methods-Time Measurement |
| AN | Aragonese Language (ISO 639-1 Code) |
| HO | Holmium |
| PNF | Pilot Not Flying (aviation) |
| JTAGS | Joint Tactical Ground Station (djay-tagz) |
| ICMP | Internet Control Message Protocol |
| CTSS | Compatible Time-Sharing System |
| PE | Ice Pellets (old Style METAR Code) - Peru (ISO 3166 And FIPS 10-4 Country Code Digram) -Physical Education - Premature Ejaculation -Prince Edward Island (postal Code) Price To Earning Ratio (used For Equity Shares) |