| Acronym | Meaning |
| MSH | Medium Support Helicopter - Mount Saint Helens |
| GEL | Georgian Lari (ISO 4217 Currency Code) - Gilbert And Ellice Islands (ISO 3166 Trigram; Obsolete 1977) |
| LED | Light-Emitting Diode |
| C2IS OR C?IS | Command And Control Information System |
| HO | Holmium |
| DDD | Data Display Debugger - Digital Digital Digital (CD Mastering) |
| DFAD | Digital Feature Analysis Data (dee-fad) |
| SWZ | Swaziland (ISO 3166 Trigram) |
| DAU | (U.S.) Defense Acquisition University |
| GFDL | GNU Free Documentation License |