/sig blok/, n.
[Internet and Usenet; 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, one's choice of witty sayings (see sig quote,
fool file), or even source code for small programs about which the author
wishes to make a statement; 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, McQuary limit.
The Free On-line Dictionary of Computing (30 December 2018):