| Acronym | Meaning |
| OPS | Operations |
| RSPB | (UK) Royal Society For The Protection Of Birds |
| 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) |
| RPN | Reverse Polish Notation |
| DK | Denmark (ISO 3166 Digram) |
| VUT | Vanuatu (ISO 3166 Trigram) |
| LJJ | Lord Justices Of Appeal |
| SWAP | Surface Waters Acidification Programme |
| DOM | Deo Optimo Maximo (Latin |
| CPT | Contingency Planning Team |