Tethrennon

The tethrennon is equal to E100#^^#^#9 = E100#^^#########100 in Extended Cascading-E Notation. The term was coined by Sbiis Saibian. Tethrennon is comparable to Bowers' tridecatrix using non-climbing method. 
==Etymology==
The name of this number is based on the number tethrathoth and the root "xennon" from "polyxennon". Polyxennon is the name for a 10-dimensional figure and 10-D figures are constructed from multiple 9-D figures (hence the "poly"), so a "xennon" can be considered a 9-dimensional figure.
== Approximations in other notations ==
Notation 	Approximation
BEAF 	\(X \uparrow\uparrow X^{9}\ \&\ 100\)
Bird's array notation 	\(\{100,10 [1 [2 \neg 2] 2] 2\}\)
Hyperfactorial array notation	\(100![1] w/12\)
Fast-growing hierarchy 	\(f_{\varphi(9,0)}(99)\)
Hardy hierarchy 	\(H_{\varphi(9,0)}(100)\)
Slow-growing hierarchy 	\(g_{\vartheta(\varphi(9,\Omega+1))}(100)\)
==Sources==
Category:Numbers
Category:Numbers by Sbiis Saibian
Category:Extended Cascading-E numbers
Category:Binary phi level
Category:Tethracubor series