(logic) An expression containing algebraic symbols that serve to represent words or other elements of a sentence or proposition

(mathematics, physics) A function which specifies the average density of atoms, molecules etc in three dimensions from a given point.

(computing) A function key whose function can be assigned by the user or by a program.

(mathematics) A function of a complex variable obtained by differentiating the logarithm of a gamma function; the digamma function / (physics) The Schrödinger wave function

(mathematics) a meromorphic function

(statistics) Any function used to obtain a set of samples from a given population

(physics) A function which is a solution of Schrödinger's wave equation; the psi function

(mathematics) Any function whose domain is a vector space and whose value is its scalar field

(mathematics, logic) A Boolean function whose value is interpreted as truth or falsity

(management) Any secondary business activity that supports the line functions of a business, but does not directly affect customers or profits