/dev-nuhl/ [from the UNIX null device, used as a data sink] n. A notional `black hole' in any information space being discussed, used, or referred to.

NULL(4)                    Linux Programmer's Manual                   NULL(4)

       null, zero - data sink

       Data written on a null or zero special file is discarded.

       Reads  from  the  null  special file always return end of file, whereas
       reads from zero always return \0 characters.

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