[abbreviation, from alt.fan.warlord] Big
Ugly ASCII Font -- a special form of ASCII art. Various
programs exist for rendering text strings into block, bloob, and
pseudo-script fonts in cells between four and six character cells
on a side; this is smaller than the letters generated by older
banner (sense 2) programs. These are sometimes used to render
one's name in a sig block, and are critically referred to as
`BUAF's. See warlording.
ig block: /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....