Source : Free On-Line Dictionary of Computing

MacBinary
     
         An eight-bit wide representation of the data and
        {resource fork}s of an {Macintosh} file and of relevant
        {Finder} information.  MacBinary files are recognised as
        "special" by several MacIntosh {terminal emulator}s.  These
        emulators, using {Kermit} or {XMODEM} or any other file
        transfer protocol, can separate the incoming file into {fork}s
        and appropriately modify the {Desktop} to display {icon}s,
        types, creation dates, and the like.
     
        (1995-03-08)