LOL, WTF!?! This is a super amusing running gag in math textbooks about none other than your cousin Throckmorton, the skateboarder, of course. But apparently there’s so much more to Throckmorton than just math textbooks. It comes from Throckmorton’s Sign, which has to do with dicks, of course…
If you actually Google it though it’s been debunked as pseudoscience