Source : Free On-Line Dictionary of Computing

wrap around
     
        (Or "wraparound", "wrap") The action of a counter that starts
        again at zero or at "minus infinity" (see {infinity}) after
        its maximum value has been reached, and continues
        incrementing, either because it is programmed to do so or
        because of an overflow (as when a car's odometer starts again
        at 0).
     
        [{Jargon File}]