em

n. (Physical Chemistry) emanation, symbol of gaseous product of radioactive separation (including radon, thoron and actinon)

n. pica, unit of typographical measure equal to 1/6 of an inch; unit of measurement of print size equal to 12 points

adj. pertaining to electromagnetism, pertaining to magnetism produced by electrical currents

EM, Em or em has several meanings:Computingemphasis (typography), or , the HTML element for emphasisExpectation-maximization algorithm, used for statistical computing
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European championship

eminence, high position, elevated rank

prep. to; under; with; into, in; at; on, upon