ledger lineledger line
Music a short line written above or below the staff, for notes beyond the range of the staff
Origin of ledger linefrom uncertain or unknown; perhaps ledger (noun), from being a horizontal “support” for, or a place to “hang,” the note
A short line placed above or below a staff to accommodate notes higher or lower than the range of the staff.
Notes F (left) and B (right) are shown on ledger lines.