Wikipedia 10K Redux by Reagle from Starling archive. Bugs abound!!!
One or more text lines automatically attached to the end of an [[email]] or [[newsgroup]] message by a reader program. A signature usually includes the name, phone number, and email address for the sender. It also sometimes includes [[AsciiArt]]. ---- This isn't the primary sense of "signature"; remember, this isn't an encyclopedia of computer stuff.