The tethritercubor (also called tethrahectacubor and tethracubiter) is equal to E100#^^###>#100 using Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.


Notation Approximation
BEAF \(X↑↑↑↑(X^2)\ \&\ 100\) (weak bound)

\(X↑↑(X^3+1)\ \&\ 100\) (strong bound)

Bird's array notation ????
Strong array notation ????
Fast-growing hierarchy \(f_{\varphi(3,\omega)}(99)\)
Hardy hierarchy \(H_{\varphi(3,\omega)}(100)\)
Slow-growing hierarchy ??


  1. Saibian, Sbiis. 4.3.7 Extended Cascading-E Numbers Part IOne to Infinity. Retrieved 2017-01-02.
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