(systems theory) A function that controls the recording, processing, transmission, or interpretation of data.

(number theory) A function, denoted by ρ, used to estimate the proportion of smooth numbers up to a given bound.

(mathematics) A Schur polynomial. / (mathematics) A holomorphic function in the Schur class.

(programming) An anonymous function; a function that is defined in an inline, ad-hoc manner, and often doesn't have a name (not bound to an identifier).

(object-oriented programming) Entity made up of all methods having the same name.

(mathematics) A meromorphic function on ℂ, defined as the (m+1)-th derivative (for a given order m) of the logarithm of the gamma function.

(mathematics) The second of the polygamma functions, after the digamma function.

(mathematics) The first of the polygamma functions, being the logarithmic derivative of the gamma function.

(databases) A function that takes input from various rows at once.

Functioning or operating at a high level.