(1) (SIGnature) A text-based name and address appended to e-mail and Usenet messages. The "sig block" is the complete signature, which may include a favorite quote or saying or even a logo made up of characters (see ASCII art).
(2) (Special Interest Group) A group of people who meet and share information about a particular topic of interest. It is usually a part of a larger group or association. See SIGGRAPH and SIGCAT.
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