The abbreviation smc could stand for many things. There is not
just one abbreviation when it is typed up in the search bar. A
couple things it could mean is standard micro controller or
Secretariat Management Committee.
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I've just now learned that it is a medical abbreviation for the
word "with".
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mb is a unit of measurement for pressure, 1 mb is 0.001 bar. mb
is an abbreviation for millibar