DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   wart
      A small, crocky feature that sticks out of an otherwise
      clean design.  Something conspicuous for localised ugliness,
      especially a special-case exception to a general rule.  For
      example, in some versions of "csh(1)", single quotes
      literalise every character inside them except "!".  In ANSI C,
      the "?" syntax used for obtaining ASCII characters in a
      foreign environment is a wart.  See also miswart.
      [Jargon File]