Angband n. /ang'band/ Like {nethack}, {moria}, and {rogue}, one of the
   large freely distributed Dungeons-and-Dragons-like simulation games,
   available for a wide range of machines and operating systems. The name
   is from Tolkien's Pits of Angband (compare {elder days}, {elvish}). Has
   been described as "Moria on steroids"; but, unlike Moria, many aspects
   of the game are customizable. This leads many hackers and would-be
   hackers into fooling with these instead of doing productive work. There
   are many Angband variants, of which the most notorious is probably the
   rather whimsical Zangband. In this game, when a key that does not
   correspond to a command is pressed, the game will display "Type ? for
   help" 50% of the time. The other 50% of the time, random error messages
   including "An error has occurred because an error of type 42 has
   occurred" and "Windows 95 uninstalled successfully" will be displayed.
   Zangband also allows the player to kill Santa Claus (who has some really
   good stuff, but also has a lot of friends), "Bull Gates", and Barney the
   Dinosaur (but be watchful; Barney has a nasty case of halitosis). There
   is an official angband home page at `http://www.phial.com/angband' and a
   zangband one at `http://thangorodrim.angband.org'. See also {Random
   Number God}.


Source: The Jargon File