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Zootzootplex is the exponential factorial of the googolplex, or $$\text{googolplex}^{(\text{googolplex}-1)^{(\text{googolplex}-2)^{.^{.^{.^{4^{3^{2^{1}}}}}}}}}$$.[1] It was coined by Andrew Schilling at the age of four. In the hyperfactorial array notation zootzootplex can be expressed as $$\text{googolplex}!1$$. It is less than and comparable to googolplexstack.

### Approximations in other notations

Notation Approximation
Arrow notation $$10^{100}\uparrow\uparrow10^{100}$$
BEAF $$\{ \{10,100\},\{10,100\},2\}$$
Bird's array notation $$\{ \{10,100\},\{10,100\},2\}$$
Chained arrow notation $$10^{100}\rightarrow 10^{100}\rightarrow 2$$
Hyperfactorial array notation $$10^{100}!1$$