Source : Free On-Line Dictionary of Computing

Binhex 4.0
     
         A seven bit wide representation of a {Macintosh}
        file with {CRC} error checking.  Binhex 4.0 files are designed
        for communication of Mac files over long distance, possibly
        noisy, seven bit wide paths.
     
        [Difference from other binhex formats?]
     
        (1996-09-17)