Higher-order Memes

The progression from standard notation for derivatives (f', f'', f''') to whatever the hell that fourth and fifth derivative notation is supposed to be. This is what happens when mathematicians run out of primes and decide "you know what would be fun? Let's just make up random symbols and expect everyone to understand them." The fifth one looks like someone sneezed while typing. Next semester's calculus exam will probably include f^(ノಠ益ಠ)ノ彡┻━┻(x) just to watch students suffer.