/rōg/
[UNIX]
n. A Dungeons-and-Dragons-like game using character graphics, written under BSD UNIX and subsequently ported to other UNIX system gue(6) and has since become one of UNIX's most important and heavily used application libraries. Nethack, Omega, Larn, and an entire subgenre of computer dungeon games all took off from the inspiration provided by rogue(6).
See nethack.