SETOF is the set constructor function for KIF. It takes any finite number of arguments and denotes the set of those things.
and also:
SetOf is a mapping q-operator for generating a set of q-expression termsfor other operators like All-Q=.
Eg: (SetOf TERM (Device-12 terminals) (TERM voltage))
would represent the set of q-expressions representing the voltages of
each terminal of Device-12.
(Undefined (Arity Setof)) (Undefined (Arity Setof)) (Undefined (Arity Setof))