11 o'clock number is a theatre term for a big, show-stopping song that occurs late in the second act of a two-act musical, in which a major character, often the protagonist, comes to an important realization. Examples include "So Long Dearie" from Hello, Dolly!, "If He Walked Into My Life" from Mame, "Rose's Turn" from Gypsy, "Work the Wound" from Passing Strange, and "Cabaret" from Cabaret. It was so named because in the days when musical performances would start at 8:30 p.m., this song would occur around 11:00 p.m.