| Meaning | Category |
| Indice Borsa Valori di Milano | Business->General |
| Made It By .... | Business->General Computing->Software |
| Make It Black | Miscellaneous->Food |
| Malicious Indestructible Bananas | Miscellaneous->Funnies |
| Man In Black | Community->Media |
| Man In Block | Community->Law |
| Management Information Base | Governmental->Military Computing->Networking Computing->Telecom Computing->Drivers |
| Management Information Block | Computing->General |
| Management Information Bulletin | Business->General |
| Management Information Database | Computing->General |
| Marketing Information Bulletin | Business->General |
| Master Interconnect Board | Governmental->NASA |
| Medical Information Bureau | Medical |
| Memory Information Block | Computing->General |
| Memory Intelligence Booster | Medical->Laboratory |
| Memory Intelligent Booster | Miscellaneous->Funnies |
| Men In Black | Community->Media |
| Men In Blue | Community->Law |
| Men In Buicks | Miscellaneous->Funnies |
| Mentoring Inbound Brothers | Community->Non-Profit Organizations |
| Message In a Bottle | Academic & Science->Ocean Science |
| Michaels Invisible Band | Community->Music |
| Military Intelligence Battalion | Governmental->Military |
| Ministry of Information and Broadcasting | Governmental |
| Mint In Box | Miscellaneous->Hobbies Business->Products |
| Mishap Investigation Board | Governmental->Military |
| Mobile Infantry Brigade | Governmental->Military |
| Monster In Bed | Miscellaneous->Science Fiction |
| Most Improved Bowler | Community->Sports |
| Most Incredibly Bad | Internet->Chat |
| Motor Insurers Bureau | Governmental->State & Local |
| Motorola Internet Browser | Computing->Software |
| Mutual Intelligence Board | Governmental->Military |
| SNMP MIB file | Computing->File Extensions |
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