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Related to ledger line: whole step
Notes F (left) and B (right) are shown on ledger lines.
A short line placed above or below a staff to accommodate notes higher or lower than the range of the staff.
1. (Music, other) music a short line placed above or below the staff to accommodate notes representing pitches above or below the staff
2. (Angling) angling a line using ledger tackle
a short line added above or below a musical staff to accommodate an increase in range.