code) MSB (i) Main Support Battalion Most Significant Bit (or Byte) MSD – (i) Minimum Safe Distance MSDB – (i) Multi Source Data Base MSDE (i) Maryland State Department of Education (p) Microsoft Data[base] Engine Microsoft SQL Server 2000 Desktop Engine (i) Military Scenario Development Environment Mission Simulation Dynamic Engine MSDL – (i) Military Scenario Definition Language MSE – (i) Multiple Subscriber Element MSEC – (p) Message Security Encryption Code ("emm-sec") MSG (i) MonoSodium Glutamate Madison Square Garden (either the 1879, 1890, 1925, or current versions of the venue) MSH (i) Medium Support Helicopter Mount St. Helens MSI (i) Micro-Star International (p) Multispectral imagery MSIE (i) Microsoft Internet Explorer Master of Science in Industrial Engineering MSL (i) Mars Science Laboratory Mean Sea Level (p) Missile MSLP – (i) Mean Sea Level Pressure MSM (p) Mainstream media (i) Men who have sex with men Mount St Mary's School MSN (i) Microsoft Network Master of Science in Nursing MSNBC – (i) Microsoft National Broadcasting Company Cable news channel (see also msnbc.com) MSO – (i) Multiple System Operator MSP - Member of the Scottish Parliament MSPA (p) Migrant and Seasonal worker Protection Act (a) MS Paint Adventures MSPB – (i) Merit Systems Protection Board MSR (i) Main Supply Route Module Service Record (s) Montserrat (ISO 3166 trigram) (i) Motor Schlepp Regulung Mountain Safety Research (outdoor supplies manufacturer) MSSA Member of the Order of the Star of South Africa (i) Methicillin-susceptible Staphylococcus aureus (i) Military Selective Service Act (i) Military-style semi-automatic (i) Mind Sports South Africa (i) Montreal Student Space Associations MSSA Chemical Company, formerly known as Métaux Spéciaux. MST (i) Madison Symmetric Torus Mountain Standard Time (UTC−7 hours) MST3K or MST3k – (i) Mystery Science Theater 3000 MSU (i) Michigan State University Montana State University Mountain State University Lomonosov Moscow State University (Russia, a.k.a. MGU) MT mt – (s) Maltese language (ISO 639-1 code) mT – (s) Millitesla Mt – (s) Meitnerium MT (s) Malta (FIPS 10-4 country code; ISO 3166 digram) Megatesla Montana (postal symbol) (i) Motor Transport (military) MTA (i) Metropolitan Transportation Authority (Boston) (now Massachusetts Bay Transportation Authority) Metropolitan Transportation Authority MTBF – (i) Mean time between failures MtF – (i) Male-to-female transsexual MTF (i) Magnetized target fusion Medical Treatment Facility Message Text Format Modulation transfer function (optics) MTG – (i) Magic: The Gathering MTL (s) Maltese lira (ISO 4217 currency code) (i) Mean Tide Level (nautical charts)* MTM –