mekso ternary operator: the generalized incomplete (factorial-extending) Pi function; for input (X_{1, X} this word outputs the definite integral of t^X_{1 e^-t} with respect to t from X_{2} to X_{3} (see notes for default values).

This is an explicit generalization of "ne'o", in case such is necessary or desirable. By default, X_{2 }= 0 and X_{3 }= +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.

- ne'o'au
- mekso quaternary operator: polygamma function; for input X
_{1, X}, outputs the (-X_{2)}th derivative of Log(ne'o'a(X_{1, X})) with respect to X_{1}.