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RSM

abbreviation for
  1. regimental sergeant major
  2. Royal School of Music
  3. Royal Society of Medicine
  4. San Marino (international car registration)
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Word Origin

(sense 4) From R(epublic of) S(an) M(arino)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012