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Grand Gigagiatrixul is equal to (...((200![200,200,200])![200,200,200])![200,200,200]...)![200,200,200] (with Gigagiatrixul parentheses), using Hyperfactorial array notation. The term was coined by Lawrence Hollom.[1]

Etymology

The name of this number is based on the word "grand" and the number "Gigagiatrixul".

Approximations in other notations

Notation Approximation
Fast-growing hierarchy $$f_{\omega^{200}200+200}(f_{\omega^{200}200+199}^4(200))$$
Hardy hierarchy $$H_{\omega^{\omega^{200}200+200}+\omega^{\omega^{200}200+199}4}(200)$$
Slow-growing hierarchy $$g_{\theta(\Omega^{200}200+199,\vartheta(\Omega^{200}200+199))}(4)$$