| Acronym | Meaning |
| DIR | Defence Industrial Research |
| C2C | The British Rail Company Formerly Known As LTS Rail |
| LOL | Laughing Out Loud (Internet Short-hand) |
| A2ATD OR A?ATD | Anti |
| RTI | Run-Time Infrastructure (Simulation) |
| 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) |
| GC | East Germany (NATO Country Code; Obsolete 1990) -General Counsel -Gigacoulomb |
| DPMO | (U.S.) Defense Prisoner Of War/Missing Personnel Office |
| HMSO | Her Majesty's Stationery Office |
| WCS | Weapon Control Status - Wildlife Conservation Society |