Simplified Common Lisp reference
Symbol class: Conses, Lists and related functions
Symbol type: function
restlist => value
Argument description:
list cons or full list

REST function returns list of all elements but first, that is cdr part of argument. REST is identical to CDR.

(rest '(1 2 3)) => (2 3)
(rest (cons 'a 'b)) => B
(rest (cons '(1 2 3) '(a b c))) => (A B C)
(rest '()) => NIL
(rest nil) => NIL
Function indexFull documentation for rest (HyperSpec)