(Cheryl of the Clue Crew chimes in about musical notation.)   It's the bookkeeping term for the lines above and below the musical staff
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BEAD Stylebook notes: The term Mormon is not properly applied to the ...... 
Cheryl Smith 32 I THE AUSTIN CHRONICLE I FEBRUARY 17, 2006 I... [DOC] [TLE] Making Light: Open Thread 187 (Worldcon Edition) [PAR] Aug 29, 2013 ...