| Acronym | Meaning |
 | HF | Hafnium |
| US | United States (alsoISO 3166 And FIPS 10-4 Country Code Digram) |
| SLAC | Stanford Linear Accelerator Center |
| IMPATT | IMPact Avalanche Transit Time Diode |
| CO | Corsican Language (ISO 639-1 Code) |
| HAWK | Homing All The Way Killer (air Defence System) |
| FEBA | Forward Edge Of The Battle Area |
| GM | The Gambia (ISO 3166 Digram) -GameMaster (role-playing) - General Motors - Genetically Modified -Germany (FIPS 10-4 Country Code) -Guru Meditation (computing) |
| SGP | Singapore (ISO 3166 Trigram) |
| CSG | Corps Support Group |
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