from
Jargon File (4.4.4, 14 Aug 2003)
Random Number God
[rec.games.roguelike.angband; often abbreviated `RNG'] The malign
force which lurks behind the random number generator in {Angband} (and
by extension elsewhere). A dark god that demands sacrifices and toys
with its victims. "I just found a really great item; I suppose the RNG
is about to punish me..." Apparently, Angband's random number
generator occasionally gets locked in a repetition, so you get
something with a 3% chance happening 8 times in a row. Improbable, but
far too common to be pure chance. Compare {Shub-Internet}.