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Grand Monster-Giant is equal to E100(#^^#)^(#^^#*#^^#...#^^#*#^^#)100 (with Monster-Giant #^^#'s in the hash product) = E100(#^^#)^(#^^#)^#100#2 in Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian.

## Approximations in other notations

Notation Approximation
BEAF $$\{100,\{100,100 ((X \uparrow\uparrow X)^X) 2\} ((X \uparrow\uparrow X)^X) 2\}$$[2]
Bird's array notation $$\{100,\{100,100 [1 [2 \backslash 2] 2 \backslash 2] 2\}\ [1 [2 \backslash 2] 2 \backslash 2] 2\}$$
Hyperfactorial array notation $$(100![1,1,[1],2,2])![1,1,[1],2,2]$$
Fast-growing hierarchy $$f_{\epsilon_0^{\epsilon_0^\omega}}^2(100)$$
Hardy hierarchy $$H_{\epsilon_0^{\epsilon_0^{\epsilon_0^\omega}}2}(100)$$
Slow-growing hierarchy $$g_{\vartheta(\varepsilon_{\Omega2}^{\varepsilon_{\Omega2}^{\vartheta(\varepsilon_{\Omega2}^{\varepsilon_{\Omega2}^{\omega}})}})}(100)$$

## Sources

1. Saibian, Sbiis. 4.3.7 Extended Cascading-E Numbers Part IOne to Infinity. Retrieved 2016-03-22.
2. Using particular notation $$\{a,b (A) 2\} = A\ \&\ a$$ with prime b.