| Acronym | Meaning |
| H | Henry - Hydrogen |
| SAVAK | Sazamane Etelaat Va Amniate Kechvar (Iranian Security And Intelligence Service) |
| MQ | Martinique (ISO 3166 Digram) - Midway Islands (FIPS 10-4 Territory Code) |
| NEPA | National Environmental Policy Act |
| PNH | Paroxysmal Nocturnal Hemoglobinuria - Police Nationale D'Ha?ti (French |
| HSSI | High-Speed Serial Interface |
| FWI | French West Indies |
| SCN | Suprachiasmatic Nucleus |
| EJ | Exajoule |
| HEOSS | High Earth Orbit Space Surveillance |