| Acronym | Meaning |
| PRFG | Partial Fog (METAR Code) |
| ERA | Earned Run Average - Engineering Research Associates - Equal Rights Amendment - English Racing Automobiles - European Railway Agency |
| MRR | Maximum Rock And Roll - Minimum-Risk Route - My Restaurant Rules |
| TH | Thorium |
| AHEC | Australian Health Ethics Committee |
| NATO | National Association Of Theatre Owners - North Atlantic Treaty Organisation |
| HP | Horse Power |
| CAN | Canada (ISO 3166 Trigram) |
| QUANGO | (British Commonwealth) QUasi Autonomous Non-Governmental Organisation |
| DITY | Do-It-Yourself |