Real Dictionary

signature in American English
a person's name written by that person; also, a representation of this in a mark, stamp, deputy's handwriting, etc.
adjective: serving to identify or distinguish a person, group, etc.
noun: a person's name, or a mark representing it, as signed personally or by deputy, as in subscribing a letter or other document

signature in British English
label it; let it be labeled
abbreviation for: (in prescriptions) signā
noun: the name of a person or a mark or sign representing the name, marked by the person or by an authorized deputy

signature in Hospitality
noun: Your signature is your name, written in your own characteristic way, often at the end of a document to indicate that you wrote the document or that you agree with what it says.