00Shoe (Double O Shoe)

This morning while I was in the shower Hannah snuck into the bathroom.

There was a pile of shoes in the bathroom that were left by Hailey.  Hannah was playing with them and putting them in order from the smallest number to the largest.   I asked to her to read the numbers to me so that I can double check that she had gotten them all right.

"Four, five, seven, double O, 21"



You can't see it so well in the picture but the shoe size here is 7 1/2
upside down apparently looks like a 21