Simplified Common Lisp reference
function
Symbol class: Functions, Evaluation, Flow Control, Definitions and Syntax
Syntax:
Symbol type: special form
functionsymbol => function
Argument description:
symbol symbol of function name

FUNCTION is special form for accessing namespace of functions. See also QUOTE.

(function sin) => #<FUNCTION>
#'sin => #<FUNCTION>
(funcall #'sin 1.0) => 0.84147096
Function indexFull documentation for function (HyperSpec)