paper-net n. Hackish way of referring to the postal service, analogizing it to a very slow, low-reliability network. USENET
sig blocks 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.