sig block: /sig blok/ n. [Unix; often written `.sig' there]
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); but
many consider large sigs a waste of bandwidth, 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.
See also doubled sig.
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