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| ANSI Common Lisp 25 Environment 25.2 Dictionary of Environment
25.2.22 *, **, *** | Variable
  Value Type: an object. Initial Value: implementation-dependent. Description: The variables *, **, and *** are maintained by the Lisp read-eval-print loop to save the values of results that are printed each time through the loop. The value of * is the most recent primary value that was printed, the value of ** is the previous value of *, and the value of *** is the previous value of **. If several values are produced, * contains the first value only; * contains nil if zero values are produced. The values of *, **, and *** are updated immediately prior to printing the return value of a top-level form by the Lisp read-eval-print loop. If the evaluation of such a form is aborted prior to its normal return, the values of *, **, and *** are not updated. Examples:
      (values 'a1 'a2)   A1, A2
      'b   B
      (values 'c1 'c2 'c3)   C1, C2, C3
      (list * ** ***)  (C1 B A1)

      (defun cube-root (x) (expt x 1/3))   CUBE-ROOT
      (compile *)   CUBE-ROOT
      (setq a (cube-root 27.0))  3.0
      (* * 9.0)  27.0
  Affected By: Lisp read-eval-print loop. See Also: - (variable), + (variable), / (variable), Section 25.1.1 Top level loop Notes:
       *   ==(car /)
       **  ==(car //)
       *** ==(car ///)
Allegro CL Implementation Details: None.

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