[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.