Provided by: freebsd-manpages_9.2+1-1_all 
NAME
zero — the zero device
DESCRIPTION
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.
FILES
/dev/zero
SEE ALSO
null(4)
HISTORY
A zero device appeared in 4.4BSD.