Eastern Maninkakan - Language code (ETLW)
Mach Number Indicated (MCD)
Madras Native Infantry - British
Maina Air Ltd. - Nigeria - FAA designator (FAAC)
Malaysian National Insurance (SAUO)
Manado - Celebes - Seismograph station code, US Geological Survey (SEIS)
M & M Manufacturing Inc., Lake Wales, FL - Manufacturer code for watercraft hull identification number (USCG)
Manning, OR - Amtrak Busline code
Manning, SC - Location identifier - FAA (FAAL)
Many - Amanteur radio shorthand (WDAA)
Masoneilan International (SAUO)
McClatchy Newspapers, Inc. - NYSE symbol (SPSG)
Media Networks, Inc.
Member of the Nautical Institute - British
Meridian Technologies, Inc. - Toronto Stock Exchange symbol
Minimum Number of Individuals - Statistics
Ministry of National Insurance - British
Modified Non-Interlocked - Indian Railway (TIR)
Montreal Neurological Institute - Medicine (EDAA)
Montserrat - West Indies - Airport symbol (OAG)
Morini Competition Arms - NCIC firearms make code (NCIC)
Movimiento Nacionalista de Izquierda - Bolivia (PPW)
Winona State University, Winona, MN - OCLC symbol (OCLC)
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