Source : Free On-Line Dictionary of Computing

fuzzball
     
        A {DEC} {LSI-11} running a particular suite of homebrewed
        software written by Dave Mills and assorted co-conspirators,
        used in the early 1980s for {Internet} {protocol} testbedding
        and experimentation.  These were used as {NSFnet} {backbone}
        sites in its early 56KB-line days.  A few were still active on
        the {Internet} in early 1991, doing odd jobs such as network
        time service.
     
        [{Jargon File}]
     
        (1994-12-05)