The tethraturreted-tethracross is equal to E100#^^##>#^^#100 using Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.

Approximations in other notations

Notation Approximation
BEAF X^^^(X^^X) & 100
Bird's array notation ???
Fast-growing hierarchy \(f_{\zeta_{\varepsilon_0} }(100)\)
Hardy hierarchy \(H_{\zeta_{\varepsilon_0} }(100)\)
Slow-growing hierarchy ???


  1. Saibian, Sbiis. 4.3.7 Extended Cascading-E Numbers Part IOne to Infinity. Retrieved 2017-03-08.
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