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The tethra-ogdon is equal to E100#^^#^#8 = E100#^^########100 in Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.

Etymology

The name of this number is based on the number tethrathoth and the root "yotton" from "polyyotton". Polyyotton is the name for a 9-dimensional figure and 9-D figures are constructed from multiple 8-D figures (hence the "poly"), so a "yotton" can be considered a 8-dimensional figure.

Approximations in other notations

Notation Approximation
BEAF $$X \uparrow^9 101\ \&\ 100$$
Bird's array notation $$\{100,9 [1 [2 \neg 2] 2] 2\}$$
Hyperfactorial array notation $$100![1] w/11$$
Fast-growing hierarchy $$f_{\varphi(8,0)}(99)$$
Hardy hierarchy $$H_{\varphi(8,0)}(100)$$
Slow-growing hierarchy $$g_{\vartheta(\varphi(8,\Omega+1))}(100)$$

Sources

1. Saibian, Sbiis. 4.3.3 - Forging Extended Cascading-E Numbers Part I. Retrieved May 5, 2014.
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