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Gigagiabixul is equal to Megagiabixul![200,200] or (((200![200,200])![200,200])![200,200])![200,200], using Hyperfactorial array notation. The term was coined by Lawrence Hollom.[1]

## Etymology

The name of this number is based on SI prefix "giga-" and the number "giabixul".

## Approximations in other notations

Notation Approximation
BEAF $$\{200,5,200,201\}$$
Fast-growing hierarchy $$f_{\omega200+199}(f_{\omega200+199}(f_{\omega200+199}(f_{\omega200+199}(200))))$$
Hardy hierarchy $$H_{\omega^{\omega200+199}4}(200)$$
Slow-growing hierarchy (using this system of fundamental sequences) $$g_{\varphi(200,198,\varphi(200,198,\varphi(200,198,\varphi(200,198,0))))}(200)$$