Sextitetremar

Sextitetremar is equal to \(f_{\psi(M \uparrow\uparrow 6)}(10)\). The term was coined by wiki user Denis Maksudov.

Etymology
The 3 parts of the name, "sexti", "tetr" and "emar", mean 6, the "in-" operation. So the full name indicates the ordinal index of the number.