The Math node with "power" selected raises the value of input 1 to the power of input 2. X^Y. I'm not sure why there are three inputs though.

But input 1 is set to 0. So, isn't the output of the node also going to always be zero?

I have the sense that a lot of materials that people sell have a lot of nonsense nodes, multiplying values by 1, adding 0, and other non-operations that serve the sole purpose of making them look more complicated than they need to be. When I go through materials trying to learn from them, I see a lot of those things. I know just enough here to be suspicious, and not enough to be sure. :/