Terricubed-tethrennon is equal to E100(#^^#^(9))^^###100 in Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.

Approximations in other notations

Notation Approximation
Bird's array notation \(\{100,100 [1 \backslash 1 \backslash 1 \backslash 2 [2 \neg 2] 2] 2\}\)
Fast-growing hierarchy \(f_{\varphi(3,\varphi(9,0)+1)}(99)\)
\(=f\)\(_\eta\)\(_{ _{\varphi(9,0)+1}}(99)\)
Hardy hierarchy \(H_{\eta_{\varphi(9,0)+1}}(100)\)


  1. Saibian, Sbiis. 4.3.3 - Forging Extended Cascading-E Numbers Part I. Retrieved May 6, 2014.
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