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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   bar
      1. <programming, convention> /bar/ The second metasyntactic
    variable, after foo and before baz.  E.g. "Suppose
      function FOO calls functions BAR..."
      2. Often appended to foo to produce foobar.
      [Jargon File]
      (1995-03-07)