:paper-net: n. Hackish way of referring to the postal service,
analogizing it to a very slow, low-reliability network. USENET
{sig block}s sometimes include a "Paper-Net:" header just
before the sender's postal address; common variants of this are
"Papernet" and "P-Net". Note that the standard {netiquette}
guidelines discourage this practice as a waste of bandwidth, since
netters are quite unlikely to casually use postal addresses.
Compare {voice-net}, {snail-mail}, {P-mail}.
-- The AI Hackers Dictionary
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....