<Dd> female shoe size (FIA) = 3 × last length in inches − 23 (\ displaystyle (\ mbox (female shoe size (FIA))) = 3 \ times (\ mbox (last length in inches)) - 23) </Dd> <P> Children's sizes are equal to men's sizes plus 12 ⁄ . Children's sizes do not differ by gender even though adults' do . </P> <Dl> <Dd> Child shoe size = 3 × last length in inches − 11 2 3 (\ displaystyle (\ mbox (Child shoe size)) = 3 \ times (\ mbox (last length in inches)) - 11 (\ frac (2) (3))) </Dd> </Dl> <Dd> Child shoe size = 3 × last length in inches − 11 2 3 (\ displaystyle (\ mbox (Child shoe size)) = 3 \ times (\ mbox (last length in inches)) - 11 (\ frac (2) (3))) </Dd>

What do d and m mean in shoe sizes