The tristaculated-tethrathoth 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^^^4 & 100
Bird's array notation ???
Fast-growing hierarchy \(f_{\varepsilon_{\varepsilon_{\varepsilon_0}}}(100)\)
Hardy hierarchy \(H_{\varepsilon_{\varepsilon_{\varepsilon_0}}}(101)\)
Slow-growing hierarchy ???

Sources

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