Double exponential function
A double exponential function is a constant raised to the power of an exponential function. The general formula is, which grows much more quickly than an exponential function. For example, if a = b = 10:
f(x) = 10¹⁰ˣ
f = 10
f = 10¹⁰
f = 10¹⁰⁰ =... Wikipedia