Source : Free On-Line Dictionary of Computing

hash collision
     
         (Or "hash clash") When two different keys hash
        to the same value, i.e. to the same location in a {hash
        table}.
     
        {ESR} once asked a friend what he expected Berkeley to be
        like.  The friend replied, "Well, I have this mental picture
        of naked women throwing Molotov cocktails, but I think that's
        just a collision in my hash tables."
     
        [{Jargon File}]
     
        (1995-01-23)