The acronym RMS has many possible meanings:

  1. A commonly used abbreviation for root mean square, a concept that comes up in subjects such as statistics and electronics.
  2. The initials and handle of free software guru Richard M. Stallman. (He is perhaps better known by his initials than his name.)
  3. An abbreviation for Royal Mail Steamer, for example the RMS Titanic and the RMS Queen Elizabeth 2. Different from His/Her Majesty's Ship which is a title reserved for commissioned warships, for example HMS Enterprise.
  4. An acronym for rate-monotonic scheduling, a scheduling technique in operating system design.

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