zero — the zero device

       The  zero  device  accepts  and  reads  data as any ordinary (and willing) file, but throws away any data
       written to it, and returns an endless supply of null bytes when read.

/dev/zero

       A zero device appeared in 4.4BSD.

Debian                                            April 7, 1996                                          ZERO(4)

       zero — the zero device

full(4), null(4)