Elon Musk: 8 curiosities about the “visionary entrepreneur”

7. The name of Musk’s son

Literally: X Æ A-XII. Elon’s wife, Claire Boucher, explained on Twitter that “X” represents an unknown variable in mathematics. “Æ” is the Elvish pronunciation of AI (artificial intelligence). The A-12 is the predecessor of the SR-17, the couple’s favorite plane, very fast but unarmed.