– Military Police – Missouri Pacific – (s) Northern Mariana Islands (postal symbol; ISO 3166 digram) mPa – (s) Millipascal MPa – (s) Megapascal MPA - Master of Public Administration MPA – (i) Maritime Patrol Aircraft MPAA – (i) Motion Picture Association of America MPC – (i) Minor Planet Center – Minor Planet Circular MPC – (i) Military Payment Certificate MPEC – (i) Minor Planet Electronic Circular MPEG – (a) Motion Pictures (Coding) Experts Group MPEV – (i) Multi-Purpose Engineering Vehicle MPF – (i) Maritime Prepositioning Force MPFC – (i) Medial PreFrontal Cortex MPG - (i) Miles Per Gallon MPMC – (i) Medial PreMotor Cortex MPSI – (i) Member of the Pharmaceutical Society of Ireland MPSoC – (i) MultiProcessor System-on-Chip MPSRON – (p) Maritime Propositioning Ship Squadron MQ MQ – (s) Martinique (ISO 3166 digram) – Midway Islands (FIPS 10-4 territory code) MR mr – (s) Marathi language (ISO 639-1 code) MR – (s) Mauritania (FIPS 10-4 country code; ISO 3166 digram) MR-ATGW – (i) Medium-Range Anti-Tank Guided Weapon MRAV – (i) Multi-Role Armoured Vehicle MRBM – (i) Medium Range Ballistic Missile MRC – (i) Maintenance Requirements Card MRD – (i) Motorized Rifle Division MRE – (i) Meal Ready to Eat (U.S. military rations) MRGO – (i) Mississippi River–Gulf Outlet Canal (also referred to as MR-GO or "Mr. Go") MRGW – (i) Medium-Range Guided Weapon mri – (s) Māori language (ISO 639-2 code) MRI – (i) Magnetic Resonance Imaging MRL – (i) Multiple Rocket Launcher MRO (i) Maintenance, Repair and Operating Mars Reconnaissance Orbiter (s) Mauritanian ouguiya (ISO 4217 currency code) MRPharmS – (i) Member of the Royal Pharmaceutical Society (Great Britain) MRR (i) Maximum Rock and Roll Minimum-Risk Route My Restaurant Rules MRS – (i) Magnetic Resonance Spectroscopy MRSA – (i/a) Methicillin-resistant Staphylococcus aureus (sometimes pronounced "MER-sa") MRT (i) Mass Rapid Transit — used as either an official or unofficial name for metro systems in Singapore, Kaohsiung, Bangkok, Taipei, Chennai, and Delhi (s) Mauritania (ISO 3166 trigram) MRTFB – (i) U.S. Major Range and Test Facility Base MS ms (s) Malay language (ISO 639-1 code) Millisecond mS – (s) Millisiemens Ms – (s) Megasecond MS (i) mano sinistra (Latin, "left hand") (p) manuscript (i) Master of Science (s) Megasiemens (p) Microsoft (sometimes M$) (s) Mississippi (postal symbol) Montserrat (ISO 3166 digram) (i) Multiple Sclerosis M&S (i) Modelling & Simulation Marks & Spencer MSA – (s) Malay language (ISO 639-2