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| ANSI Common Lisp 14 Conses 14.2 Dictionary of Conses
14.2.6 consp | Function
  Syntax: consp object generalized-boolean Arguments and Values: object - an object. generalized-boolean - a generalized boolean. Description: Returns true if object is of type cons; otherwise, returns false. Examples:
       (consp nil)  false
       (consp (cons 1 2))  true
  The empty list is not a cons, so
       (consp '()) ==(consp 'nil)  false
  See Also: listp Notes:
       (consp object) ==(typep object 'cons) ==(not (typep object 'atom)) ==(typep object '(not atom))
Allegro CL Implementation Details: None.

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