Complete Encyclopaedia of Music/B/Barred semicircle
Barred semicircle. Used to denote a quicker movement than the semicircle without the bar, and is called alla breve, because it was formerly written with one breve in a measure.
Barred semicircle. Used to denote a quicker movement than the semicircle without the bar, and is called alla breve, because it was formerly written with one breve in a measure.