# Is there a symbol for exponentiation?

When we define a structure, let's say a group, we write $(G ,\oplus )$ for an operation $\oplus$. In case I want to define a structure with operation exponentiation I just define the $\oplus$ so that $a \oplus b = a^b$, which is what I have done until now. But a curiosity of mine is, if there exists, or if it ever existed, a symbolic representation of exponentiation.

Thus, have you ever come across a symbol for exponentiation?

• What about the up arrow $\uparrow$ ? – Yves Daoust Feb 11 '15 at 14:16