IgM

IGM might be an acronym or abbreviation for:

The polymeric immunoglobulin, IgM
International Grandmaster
intergalactic medium
Intragroup medium - see: Intracluster medium
IG Metall - the dominant German metalworkers' union
IGM is an acronym created by Robinson Technologies for several early BBS door games, including

Legend of the Red Dragon II: New World

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