DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   out
      <programming> A type or "mode" of function parameter that
      passes information in one direction - from the function to the
      caller.  An "out" parameter thus provides an additional
      return value, typically for languages that don't have good
      support for returning data structures like lists.  Other
      modes are in and inout.
      (2010-01-19)