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The Brother-Giant (also called Cintaur) is equal to E100#^^#^#^^#^#100 using Extended Cascading-E Notation.[1] The term was coined by Sbiis Saibian. This number appears to be similar to Monster-Giant (E100(#^^#)^(#^^#)^#100) except the parentheses have been removed this time which makes this number much larger than Monster-Giant, and very close to E100#^^#^^#^#100.

Approximations

Notation Approximation
Bird's array notation $$\{100,100[1[1[2 \lnot 2]2 \lnot 2]2]2\}$$
Fast-growing hierarchy $$f_{\varphi_{\varphi_\omega(0)}(0)}(100)$$