doubled sigA sig block that has been included twice in a Usenet article or, less commonly, in an electronic mail message. An article or message with a doubled sig can be caused by improperly configured software. More often, however, it reveals the author's lack of experience in electronic communication. See BIFF, pseudo. [Jargon File]
Last updated: 1994-12-07
double density ♦ doubled sig ♦ double-duplex ♦ double-ended queue
Try this search on Wikipedia, Wiktionary, Google, OneLook.