Trinimah

Trinimah is equal to \(f_{\underbrace{\psi(M_{M_{..._{M}}})}_{4 \quad M's}}(10)\). The term was coined by Denis Maksudov

Etymology
The 3 parts of the name, "tri", "in" and "imah", mean \(3\), the "in-" operation. So the full name indicates the ordinal index of the number.