1. (chemistry) Initialism of uridine diphosphate
  2. (computing) Initialism of user datagram protocol jocular: "unreliable datagram protocol," pertaining to the lossy protocol's inherent bias to drop packets under heavy load.
  3. (Internet) Initialism of Usenet death penalty
Proper noun
  1. (Ireland, politics) Initialism of Ulster democratic party
  2. (military, US) Initialism of unit deployment program

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