Source : Free On-Line Dictionary of Computing

visible bell
     
         (Or "visual bell") A program option (whether
        in a terminal program, {termcap} setting, or as a
        {stand-alone} program) which outputs the {bell} {character
        code} as a visual signal (e.g., a flashing status bar or menu
        bar).
     
        Generally intended for deaf or hearing-disabled users who
        couldn't hear the normal auditory beep; also widely used by
        users who simply don't want their machines {feep}ing at them
        or disturbing other users.
     
        [Implementations?]
     
        (1997-04-07)