A Bernoulli gate is a module that routes each incoming trigger or gate to one of two outputs at random. A control sets how likely it is to choose either one, from always the first output, to an even coin toss, to always the second.
It is used to split a clock into varied rhythms, such as sending some hits to a kick and others to a snare. The name comes from the Bernoulli distribution in probability, which describes a random choice between two outcomes.