| Acronym | Meaning |
| MEX | Mexico (ISO 3166 Trigram) |
| VACIS | Vehicle And Container Inspection System |
| CIO | Chief Information Officer - Congress Of Industrial Organizations |
| SU | Soviet Union (ISO 3166 Digram; Obsolete 1992) - Sudan (FIPS 10-4 Country Code) |
| STFU | Shut The Fuck Up |
| USNO | U.S. Naval Observatory |
| MG | Machine Gun -Madagascar (ISO 3166 Digram) -Major General -Mongolia (FIPS 10-4 Country Code) -Morris Garage |
| SM | Samarium |
| UCF | University Of Central Florida |
| SEATO | Southeast Asian Treaty Organization |