>>21428870
They're letters. I and Z. The 9th and 26th letter of the Alphabet. Combined they come to 33 which is one third of 100. 100 is C in Roman numerals which is the third letter of the alphabet. 3 divided by 3 is 1, which is how many arms that guy has. It's a very clever little joke, much funnier if it doesn't have to be explained.