Hey guys! Steve here to explain the joke. So basically, due to the law California state law, names with numbers aren’t allowed. This means that Elon Musk’s child, X Æ X-12 does not comply with the rules and therefore has an unruly name. A clever way to bypass this law is to just write the 12 in X Æ X-12’s name in Roman numeral, so that it uses letters instead if numbers, and technically acts in accordance to the California state law.