lispdoc - results for characterp

(characterp object)
Function: Return true if OBJECT is a CHARACTER, and NIL otherwise.
Example:
(defun duplicable? (x)
  (or (numberp x) (symbolp x) (characterp x)))
Mentioned in:
CLtL2 - 13.2. Predicates on Characters
CLtL2 - 6.2.2. Specific Data Type Predicates
HyperSpec - Function CHARACTERP