Good grief man. I literally just grepped through my installed packages for '₁', looked for a relatively interesting line with lots of unicode, saw "haversine" and realized it was a simple formula others would understand and that I would be able to find an image of online, and then hit google images looking for it.

The point isn't the algorithm itself. The point is just how using unicode allows you to match the style of an arbitrary algorithm out of a textbook.