Tuesday was Pi Day, the best day of the year for math nerds.
Not to be mistaken for Pie Day, which is everyday, but Pi Day—March 14. It's the date that matches best with the mathematical symbol Pi, which is approximately the number 3.14, but in reality extends after the decimal point to infinity.
That brings us to a fun receipt joke you're going to want to copy the next time you go out to eat on Pi Day (if you're one of the aforementioned nerds). Recently shared on Reddit, someone signed their receipt like this: