M3

from WordNet (r) 3.0 (2006)

M3
    n 1: a measure of the money supply; M2 plus deposits at
         institutions that are not banks (such as savings and loan
         associations)

from The Collaborative International Dictionary of English v.0.48

M3 \M3\ n.
   A broad measure of the money supply, comprising M2 plus
   deposits at nonbanks such as savings and loan associations.
   [WordNet 1.5]

from The Free On-line Dictionary of Computing (8 July 2008)

M3

   A {macro} processor, forerunner of {M4}, for the {AP-3}
   {minicomputer}.

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