mekso ternary operator: the generalized incomplete (factorial-extending) Pi function; for input (X1, X this word outputs the definite integral of t^X1 e^-t with respect to t from X2 to X3 (see notes for default values).
This is an explicit generalization of "ne'o", in case such is necessary or desirable. By default, X2 = 0 and X3 = +infty. The output of this function is offset from the factorial by 0 (making this word consistent with "ne'o") and from the Gamma function by 1.