2.) the smallest measurable unit (about 0.001 femtometers)
3.) (Nautical, Nuclear) a quickly estimated unit of length equal to one hundred quadrillionth of a meter, often abbreviated as RHC when females or effeminate males are present.
n'see how this door fits?"
CARPENTER 2:"Hmmm...'bout a coupla RED CUNT HAIRS off the
bottom oughta' do it.Break out the sander."