Grand tethracross

The grand tethracross is equal to E100#^^##100#2 using Extended Cascading-E Notation. The term was coined by Sbiis Saibian. This number is comparable with Grand Penthrathoth.
== Etymology ==
The name of this number is based on the prefix "grand" (which adds #2 at the end of the expression) and the number "tethracross".
== Approximations in other notations ==
Notation 	Approximation
BEAF 	\(X \uparrow\uparrow\uparrow \text{tethracross}\ \&\ 100\) (non climbing)
\(X \uparrow\uparrow \text{tethracross}^{2} \&\ 100\) (climbing)
Bird's array notation 	{100,3,2[1\1\2]2}
Fast-growing hierarchy	\(f_{\zeta_0}(f_{\zeta_0}(100))\)
Hardy hierarchy 	\(H_{\zeta_0 2}(100)\)
Slow-growing hierarchy	\(g_{\vartheta(\zeta_{\Omega+\vartheta(\zeta_{\Omega+1})})}(100)\)
== Sources ==
Category:Numbers
Category:Numbers by Sbiis Saibian
Category:Extended Cascading-E numbers
Category:Binary phi level
Category:Tethracross regiment