factorial factorial

It's hard not to get excited about factorials. After all, they come with their own built-in exclamation point. Plus, they very quickly get way out of hand. Ask your calculator if you don't believe us. Factorials are the party creatures of the math world. You can imagine them, drunk, on the rooftop, screaming their own name at the top of their lungs. "FAAAAACCCTORIALLLL!" Or maybe not. All we know is if you invite factorial! to your party, you'd better be prepared for lampshade-headed antics.

"factorial!" printed in white on a forest green, 100% cotton t-shirt.