| Acronym | Meaning |
 | EIRP | Effective Isotropic Radiated Power |
| TMTOWTDI | There's More Than One Way To Do It (from Perl) |
| SCT | Scattered Sky (METAR Code) |
| CS | Caesium |
| IMSA | Illinois Mathematics And Science Academy - International Mind Sports Association - International Motor Sports Association |
| NG | Nanogram - Ndonga Language (ISO 639-1 Code) |
| USPS | United States Postal Service |
| WFF | Wallops Flight Facility |
| GW | Games Workshop - Germ Warfare -Gigawatt -Guided Weapon -Guinea-Bissau (ISO 3166 Digram) |
| PLF | Parachute Landing Fall |
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