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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   copper
      <hardware> Conventional electrical network cable with a core
   conductor of
      copper (or aluminium!), as opposed to other kinds of connection like
   a light
    pipe or microwave link.
      [Jargon File]
      (1994-11-30)