Bis

Bis is Latin (and French/Italian) for ‘twice’. As a notation direction it instructs the performer to repeat the marked passage. The marking has been used since the Renaissance for various forms of repeat instruction.

In modern usage, ‘bis’ is uncommon in score notation — the standard repeat sign (𝄆 𝄇) has largely replaced it. But the term survives in audience usage: at concerts, audiences shout ‘Bis!’ to demand an encore, the performer’s repetition (or addition) of music after the official program ends.

The word ‘encore’ (French for ‘again’) is similarly used both in audience cry and as a name for the additional pieces performed. ‘Bis!’ is more common in Italian and French traditions; ‘Encore!’ in English-speaking ones.

Latin, ‘twice’.

If you see ‘bis’ in a score, repeat the marked passage. If you hear it shouted from the audience, prepare for an encore.