| Acronym | Meaning |
 | SDH | Synchronous Digital Hierarchy |
| HSC | High School Certificate (as Used In New South Wales) |
| AGS | Alaska Ground Station (LandSat) |
| HEPA | High-Efficiency Particulate Air (filter) |
| FYDP | Five-Year Defense Plan (U.S.) |
| SJA | Staff Judge Advocate (military Law) |
| NLD | Dutch Language (ISO 639-2 Code) |
| MDW | Chicago Midway International Airport In Chicago |
| MC | Macao (FIPS 10-4 Territory Code) -Master Of Ceremonies -Megacoulomb -Military Cross (bravery Award) -Monaco (ISO 3166 Digram) -Mortar Carrier -Eleven Hundred (in Roman Numerals) |
| MTBF | Mean Time Between Failures |
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