Septinphi

Septinphi is equal to \(f_{\Gamma_0[8]}(10)\) using the fast-growing hierarchy,My system of number names (FGS) - Traveling To The Infinity where \(\Gamma_0\) is the Feferman-Schütte ordinal.
The term was coined by wiki user Denis Maksudov.
== Etymology ==
The 3 parts of the name, "septi", "in" and "phi", mean 7, the "in-" operation and \(\varphi\) function respectively, which form \(\Gamma_0[8]\) (i.e. 7 more insertions of \(\varphi\)) 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