An old US TV show made popular the concept "Is it bigger than a breadbox" (I think it was Kitty Kallen on "20 Questions")


and many guys know a version of an R.C.H. Many years ago, I knew a fellow who was calibrating an instrument to measure air pollution. He tweaked and muttered and finally said, "Hmmm... off by an R.C.H" Silly me... I asked.

Turns out, various hair colors are supposed to vary in basic thickness. Blond is finest, then (R)ed.... so... RCH. I'll leave you to fill in the 'C'.