ledger-line
US /ˈledʒ.ɚ ˌlaɪn/
UK /ˈledʒ.ɚ ˌlaɪn/
1.
dòng sổ cái
a short line added above or below a musical staff (= the five lines and four spaces between them on which musical notes are written) to increase its range:
:
•
Middle C can be written below the treble staff, or above the bass staff by using a ledger line.