| Acronym | Meaning |
| ASIO | Australian Security Intelligence Organisation -Audio Stream Input Output |
| NAVS | Non-Cooperative Airborne Vector Scoring |
| MMCS | Machinist's Mate |
| MK | Air Mauritius (IATA Code) - Macedonia (ISO 3166 Digram; FIPS 10-4 Country Code) -Mandalskameratene (Norwegian Football Club) -Megakelvin -Missionary Kid - Mortal Kombat (game) |
| TLM | Traditional Latin Mass Or Tridentine Latin Mass |
| A/C | Air Conditioned/Conditioning - Aircraft |
| APHIS | Animal And Plant Health Inspection Service |
| USNI | United States Naval Institute |
| OECD | Organization For Economic Co-operation And Development (international) |
| C4 OR C? | Command |