Exinamus

Exinamus is equal to \(f_{\psi(\upsilon[10^{18}])}(10)\). The term was coined by Denis Maksudov.

Etymology
The 4 parts of the name, "exo", "in", "am", and "us", mean \(10^{18}\), "in-" operation. So the full name indicates the ordinal index of the number.