(1) (
SIGnature) A text-based name and address appended to email 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.