Discrete distributions come from a variety of backgrounds, but perhaps the most common relate back to the simple Bernoulli trial, which chooses between two outcomes, called ...
CumulantGeneratingFunction[dist, t] gives the cumulant generating function for the symbolic distribution dist as a function of the variable t. ...
NegativeBinomialDistribution[n, p] represents a negative binomial distribution with parameters n and p.
NakagamiDistribution[\[Mu], \[Omega]] represents a Nakagami distribution with shape parameter \[Mu] and spread parameter \[Omega].
ZipfDistribution[\[Rho]] represents a zeta distribution with parameter \[Rho].ZipfDistribution[n, \[Rho]] represents a Zipf distribution with range n.
BesselI
(Built-in Mathematica Symbol) BesselI[n, z] gives the modified Bessel function of the first kind I_n (z).
PascalDistribution[n, p] represents a Pascal distribution with parameters n and p.
EulerGamma is Euler's constant \[Gamma], with numerical value \[TildeEqual] 0.577216.
Range
(Built-in Mathematica Symbol) Range[i_max] generates the list {1, 2, ..., i_max}. Range[i_min, i_max] generates the list {i_min, ..., i_max}. Range[i_min, i_max, di] uses step di.
SpokenString[expr] gives a string of text corresponding to a spoken representation of the expression expr.