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A googolbangstack is equal to $$10\uparrow\uparrow(\text{googolbang})$$ or $$10\uparrow\uparrow(\text{googol}!)$$ [1]

## Etymology

The name of this number can be separated into 3 parts, "googol", "-bang" and "-stack", where suffix "-bang" means factorial operation, and "n-stack" means $$10\uparrow\uparrow n$$. To get the name, the "-bang" first applies on the "googol", then the "-stack" applies on the "googolbang".

## Approximations

Notation Approximation
Arrow notation $$10\uparrow\uparrow(10\uparrow 10\uparrow 102)$$
Hyper-E notation E102#2#2
Fast-growing hierarchy $$f_3(f_2^2(327))$$