NASCAR no

• Record no
• Letters on an LP or 45
• Engine rate: Abbr
• Dash letters
• Platter letters
• Dashboard reading: Abbr.
• Record number: Abbr
• 45 or 78, for short

Wikipedia Word definitions in Wikipedia
RPM (also known as R.P.M. ) Is a 1998 action film starring David Arquette , Emmanuelle Seigner , and Famke Janssen . It was shot in 1997 and first released on video in Germany on June 23, 1998. An earlier unrelated film with the same title, R. P. M. , was ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1906, initialism (acronym) from revolutions per minute .