Source : Free On-Line Dictionary of Computing

/dev/null
     
        /dev-nuhl/ [The Unix null device, used as a {data sink}] A
        notional "black hole" in any information space being
        discussed, used, or referred to.  A controversial posting, for
        example, might end "Kudos to [email protected], flames to
        /dev/null".  See {bit bucket}.
     
        [{Jargon File}]