I knew the RMS initials were common as muck, but there were even more than I expected. Ones I knew already:

  • My own name!
  • Richard (Matthew) Stallman
  • Royal Mail Ship, such as RMS Lusitania
  • Roads and Maritime Services, in New South Wales
  • Root mean square, used in electric current
  • Record management systems

And according to Wikipedia:

  • Rights Managament Services in Windows Server 2003