The ultimate nerd joke has arrived! What we're seeing is π (pi) with all its digits labeled as "prime" or not. Each digit in the decimal expansion of π (3.14159...) has a line connecting to the word "prime" if that digit is a prime number (2, 3, 5, 7). Non-prime digits (0, 1, 4, 6, 8, 9) are left unlabeled.
It's basically a mathematical love letter to the intersection of irrational numbers and prime numbers. The beauty is in how these two mathematical concepts that shouldn't have any relationship are forced together in this delightfully awkward mathematical union. Number theory humor at its finest!