Source : Free On-Line Dictionary of Computing

hole model
     
         A {model} of semiconductor behaviour in which
        {donors} contribute a positive charge equal in magnitude to
        the charge of an {electron}, and {acceptors} contribute space
        for such a charge within the crystal lattice.  Honored by
        history well before electrons were discovered and described,
        much of {electronics}, especially at the engineering level,
        continues to consider {current} as flowing from positive to
        negative.
     
        (1995-10-05)