| Acronym | Meaning |
| CBRN | Chemical |
| MF | Mayotte (FIPS 10-4 Territory Code) - Megafarad |
| MHZ | Megahertz |
| VEB | Venezuelan BolĀvar (ISO 4217 Currency Code) |
| MK | Air Mauritius (IATA Code) - Macedonia (ISO 3166 Digram; FIPS 10-4 Country Code) -Mandalskameratene (Norwegian Football Club) -Megakelvin -Missionary Kid - Mortal Kombat (game) |
| LLC | Limited Liability Company |
| CHAOS | Cambridge Heart Anti-Oxydant Study |
| PEK | PolyEtherKetone |
| MRR | Maximum Rock And Roll - Minimum-Risk Route - My Restaurant Rules |
| MRSA | Methicillin-resistant Staphylococcus Aureus |