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| ANSI Common Lisp 5 Data and Control Flow 5.3 Dictionary of Data and Control Flow
5.3.32 t | Constant Variable
  Constant Value: t. Description: The boolean representing true, and the canonical generalized boolean representing true. Although any object other than nil is considered true, t is generally used when there is no special reason to prefer one such object over another. The symbol t is also sometimes used for other purposes as well. For example, as the name of a class, as a designator (e.g., a stream designator) or as a special symbol for some syntactic reason (e.g., in case and typecase to label the otherwise-clause). Examples:
       t   T
       (eq t 't)  true
       (find-class 't)  #<CLASS T 610703333>
       (case 'a (a 1) (t 2))  1
       (case 'b (a 1) (t 2))  2
       (prin1 'hello t)
       HELLO
        HELLO
See Also: nil Allegro CL Implementation Details: None.

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