Zettophi

Zettophi is equal to \(f_{\varphi(10^{21},0)}(10)\) using the fast-growing hierarchy and Veblen's function's fundamental sequences.My system of number names (FGS) - Traveling To The Infinity The term was coined by wiki user Denis Maksudov.
== Etymology ==
The 2 parts of the name, "zetto" and "phi", mean \(10^{21}\) and \(\varphi\) function respectively, which form \(\varphi(10^{21},0)\) when concatenated backwards. So the full name indicates the ordinal index of the FGH.
== Sources ==
Category:Numbers
Category:Numbers by Denis Maksudov
Category:10-based FGH numbers
Category:Binary phi level
Category:-phi