That reminds me of a similar "little-known feature" on SunOS and
Solaris, where /bin/sh interprets '^' as a synonym for '|' :
$ sh -c 'echo blah ^ cat'
This archaic compatibility feature is not only of SunOS/Solaris but also
of Ultrix4.3A (both sh and sh5) and HP-UX 9.05. Ksh, pdksh and /bin/posix/sh
do not support this.