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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
signature
sig
1. A set of function symbols with arities.
2. (Or sig) A few lines of information about the
sender of an electronic mail message or news posting.
Most Unix mail and news software will automagically append
a signature from a file called .signature in the user's {home
directory} to outgoing mail and news.
A signature should give your real name and your {e-mail
address} since, though these appear in the headers of your
messages, they may be munged by intervening software. It is
currently (1994) hip to include the URL of your home page
on the web in your sig.
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). However, large sigs are a
waste of bandwidth, and it has been observed that the size
of one's sig block is usually inversely proportional to one's
prestige on the net.
See also doubled sig, sig virus.
2. A concept very similar to {abstract base
classes} except that they have their own hierarchy and can
be applied to compiled classes. Signatures provide a means
of separating subtyping and inheritance. They are
implemented in C++ as patches to GCC 2.5.2 by Gerald
Baumgartner .
(ftp://ftp.cs.purdue.edu/pub/gb/).
(2001-01-05)