sig block

sig block
 /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}.
    

sig block

   /sig blok/ [Unix; often written ".sig" there].  See
   {signature}.

   [{Jargon File}]