| Acronym | Meaning |
| BSOD | Blue Screen Of Death (distinct From BSD) |
| DRA | Defence Research Agency (UK |
| MAC | Macao (ISO 3166 Trigram) -U.S. Military Airlift Command (1966-1992) |
| HIN | Hindi Language (ISO 639-2 Code) |
| AFK | Away From Keyboard (Internet Chat Abbreviation) |
| FAO | Faroese Language (ISO 639-2 Code) |
| MZ | Mach-Zehnder (interferometer) -Magnetic Azimuth -Move |
| MT | Maltese Language (ISO 639-1 Code) |
| PDRY | People's Democratic Republic Of Yemen (obsolete Since 1990) |
| MASER | Microwave Amplification By Stimulated Emission Of Radiation |