MI
- mi – (s) Māori language (ISO 639-1 code)
- Mi – (s) Mebi
- MI
- (s) Malawi (FIPS 10-4 country code)
- Michigan (postal symbol)
- Midway Islands (ISO 3166 digram; obsolete 1986)
- (i) Military Intelligence
- MIA – (i) Missing In Action
- MIB
- (i) Men In Black
- Mint In Box (Internet auction/trading listings)
- MICLIC – (p) Mine Clearing Line Charge
- MICOM – (p) Missile Command
- MICV – (i) Mechanised Infantry Combat Vehicle
- MID – (s) Midway Islands (ISO 3166 trigram; obsolete 1986)
- MIDI – (a) Musical Instrument Digital Interface
- MIDAS – (a) Man-machine Integration Design and Analysis System
- MIDS – (i) Multi-Function Information Distribution System
- MIFG – (s) Shallow Fog (METAR Code)
- MIKE – (a) Monitoring of Illegal Killing of Elephants
- MIL – (i) Man-In-the-Loop
- MIL-AASPEM – (i) Man-In-the-Loop AASPEM
- MILAN – (p) Missile d´infanterie léger antichar (French, "Anti-Tank Light Infantry Missile")
- MILC – (a) Mirrorless interchangeable-lens camera
- MILES – (a) Multiple Integrated Laser Engagement System (live combat simulation)
- MILF
- (i) Moro Islamic Liberation Front
- (a) Mother I'd Like to Fuck
- MILSATCOM – (p) Military Satellite Communications
- MILSET – (a) Mouvement International pour le Loisir Scientifique Et Technique (French, "International Movement for Leisure Activities in Science and Technology")
- MILSTRIP – (p) Military Standard Requisitioning and Issue Procedure DLMSO MILSTRIP Manual
- MIMAROPA – (p) Mindoro, Marinduque, Romblon, Palawan (a region in the Philippines)
- MIMOSA – (a) MIcroMeasurements Of Satellite Acceleration
- MIMPT – (i) Member of the Institute of Maxillofacial Prosthetists and Technologists
- MIP
- (a) Multilateral Interoperability Programme
- Multiple Identity Poster
- MIRA – (a) MILAN Infra-Red Acquisition (thermal sight)
- MIRV – (a) Multiple Independent Reentry Vehicle
- MIS
- (a) Management Information Systems
- Museum Information System
- MISREP – (p) Mission Report
- MISSI – (a) Multilevel Information System Security Initiative
- MIT
- (i) Massachusetts Institute of Technology
- methylisothiazoline
- Milli Istihbarad Teskilati (Intelligence service of Turkey)
- MITL – (i) Man-In-The-Loop
- MITS – see entry
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