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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Boolean
   bool
      <logic> 1. Boolean algebra.
      <programming> 2. (bool) The type of an expression with two
      possible values, "true" and "false".  Also, a variable of
      Boolean type or a function with Boolean arguments or result.
      The most common Boolean functions are AND, OR and NOT.
      (1997-12-01)