What does mao stand for?

Maori - MARC language code - Library of Congress (LCCP)

Cape Cod Boat & Sport, Hanson, MA - Manufacturer code for watercraft hull identification number (USCG)

Ixcatlan Mazateco - Language code (ETLW)

J. Manton & Co. - NCIC firearms make code (NCIC)

MAC Aviation SL - Spain - ICAO designator (FAAC)

Magnetic Amplifier Output

Mailing Address Only - Military (AABC)

Maintenance and Operation - Army (AFIT)

Major Attack Option - Military (MCD)

Manaus - Brazil - Airport symbol (OAG)

Manned Apollo Operations - NASA (KSC)

Marion, SC - Location identifier - FAA (FAAL)

Mars Aeronomy Orbiter (MCD)

Massive Attack Option (MCD)

Master of Art of Oratory

Master of the Art of Obstetrics

Matair Ltd. - British - ICAO designator (FAAC)

Material Adjustment Order (MCD)

Maximum - or Minimum Acid Output - Clinical chemistry

Mechanization of Algebraic Operations (PDAA)

Medial Ankle Orthosis - Orthopedics (DAVI)

Medical Assistance Only (GFGA)

Methylaluminoxane - Organic chemistry

Methyl Aluminoxane Cocatalyst

Military Assistance Officer - Army

Minneapolis Age and Opportunity (Center) - Medicine (EDAA)

Monoamine Oxidase - An enzyme

Monoamin Oxidase Inhibitors - An antidepressant

Movement to Arrest Oppressors (EA)

Muhammadan Anglo-Oriental