A key in ProbabilityDistribution objects and an option for discreteProbabilityDistribution and continuousProbabilityDistribution for setting the probability density/mass function to be used by density.
The object DensityFunction is a symbol.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Probability.m2:551:0.