k0
A math thing that shows how smart someone is. A k0 is the weakest, and you go up from there. If you're a k0, you're just playing random.
I'm a k0. I just play scissors and hope for the best.
My friend is a k1. He plays scissors because he knows Bob plays paper.
I'm a k2. I know Bob knows I play rock, so I play scissors to win.