I looked at this when I took it, and thought it’s that blue-pink pH thing. Then I thought hmmmm what’s pH stand for? I had college chemistry, so, geeze I should have been told this/read it. Okay, WikiPee, what’s it stand for? Turns out there’s no clear answer. Guess that’s why I don’t remember!
Chalk cat. Not to be confused with a hill figure (Brit.).