ETYM French (cf. Italian signatura, segnatura, Spanish and Late Lat. signatura), from Latin signare, signatum. Related to Sign.
1. A melody used to identify a performer or a dance band or radio/tv program; SYN. signature tune, theme song.
2. One's name written in one's own handwriting.

A sheet with several pages printed on it; it folds to page size and is bound with other signatures to form a book.