Septaddommthet

is equal to \(f_{\varphi(1,7,0)}(10)\) using the fast-growing hierarchy with fundamental sequences for the Veblen function. This term was coined by wiki user and is comparable to Saibian's pentacthul-ogdon, accessed 2023-11-25. 
It is also exactly equal to \(f_{\theta(\Omega+7,0)}(10)\) using Feferman's theta function, hence the name.
== Sources ==
Category:Numbers
Category:Numbers by Redstonepillager
Category:10-based FGH numbers
Category:Bachmann's collapsing level
Category:-ommthet