Related:

• HAND // [Usenet: very common] Abbreviation: Have A Nice Day.
  Typically used to close a Usenet posting, but also used to informally close email...
• YHBT // [Usenet: very common] Abbreviation: You Have Been Trolled (see troll, sense 1).
  Especially used in "YHBT. YHL. HAND.", which is widely understood to expand to "You Have Been Trolled....
• ignal-to-noise ratio: [from analog electronics] n.
  Used by hackers in a generalization of its technical meaning....
• ignal-to-noise ratio [from analog electronics] n. Used by hackers in a generalization of its technical meaning.
  `Signal' refers to useful information conveyed by some communications medium, and `noise' to anything else on that medium....
• OTOH // [Usenet; very common] On The Other Hand.
• alk mode n. A feature supported by Unix, ITS, and some other OSes that allows two or more logged-in users to set up a real-time on-line conversation.
  It combines the immediacy of talking with all the precision (and verbosity) that written language entails....
• ACK /ak/ interj. 1. [common; from the ASCII mnemonic for 0000110] Acknowledge.
  Used to register one's presence (compare mainstream Yo!...
• PHB /P-H-B/ [Usenet; common; rarely spoken] Abbreviation, "Pointy-Haired Boss".
  From the Dilbert character, the archetypal halfwitted middle-management type....
• flamage /flay'm*j/ n. [very common] Flaming verbiage, esp.
  high-noise, low-signal postings to Usenet or other electronic fora....