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Expofaxul is equal to 200!1 in Hyperfactorial array notation, or 200 expofactorial. The term was coined by Lawrence Hollom.[1] It is slightly larger than a giggol.

## Etymology

The name of this number is based on prefix "expo-" and the number "faxul".

## Approximations in other notations

Notation Approximation
Hyper-E notation $$\textrm E183230\#196$$
Up-arrow notation $$10 \uparrow\uparrow 198$$
Chained arrow notation $$10 \rightarrow 198\rightarrow 2$$
BEAF $$\{10,198,2\}$$
Fast-growing hierarchy $$f_3(197)$$
Hardy hierarchy $$H_{\omega^3}(197)$$
Slow-growing hierarchy $$g_{\varepsilon_{0}}(198)$$