(Cheryl of the Clue Crew chimes in about musical notation.)   It's the bookkeeping term for the lines above and below the musical staff
I was in a classical sheet music store (this one, actually) earlier this ... BAM had a 
40x20 grid to display its map, and just 16 possible ...... Cheryl @144: Which, 
incidentally, is also why I only drink milk from organically farmed cows.