Label xⁿ is ambiguous for exp operator

[kyraha]

There's no register "n" in the calculator, so it's ambiguous what is going to be the base and what will be the power. But there's a convention in RPN to call the tip of the stack the X, and the next element in the stack the Y. Then the exponentiation operator could be labeled as yˣ. Then it'll be easier to remember that the last entered number will be the power.