/sig blok/ [UNIX; often written `.sig' there] n.
Short for `signature', used specifically to refer to the
electronic signature block that most UNIX mail- and news-posting
software will automagically
append to outgoing mail and news.
The composition of one's sig can be quite an art form, including an
ASCII logo or one's choice of witty sayings (see sig quote
fool file, the
); but many consider large sigs a waste of
, and it has been observed that the size of one's sig
block is usually inversely proportional to one's longevity and
level of prestige on the net.