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The xappol is equal to {10,10 (2) 2}, or 10 by 10 array of 10's in BEAF.[1]

The xappol is written out in the multirowed array notation as:

        /10 10 10 10 10 10 10 10 10 10\

/  10 10 10 10 10 10 10 10 10 10  \

/    10 10 10 10 10 10 10 10 10 10    \

/      10 10 10 10 10 10 10 10 10 10      \

/        10 10 10 10 10 10 10 10 10 10        \

\        10 10 10 10 10 10 10 10 10 10        /

\      10 10 10 10 10 10 10 10 10 10      /

\    10 10 10 10 10 10 10 10 10 10    /

\  10 10 10 10 10 10 10 10 10 10  /

\10 10 10 10 10 10 10 10 10 10/


Approximations

Notation Approximation
Bird's array notation $$\{10,10 [3] 2\}$$
Cascading-E notation $$E10\#\text{^}\#\#10$$
Hyperfactorial array notation $$10![1,[1,1,3],1,2]$$
Fast-growing hierarchy $$f_{\omega^{\omega^2}}(10)$$
Hardy hierarchy $$H_{\omega^{\omega^{\omega^2}}}(10)$$
Slow-growing hierarchy $$g_{\vartheta(\Omega^{\Omega\omega})}(10)$$

Trivia

• The Googology Wiki IRC channel used to have a bot named XappolBot.
• Jonathan Bowers describes Xappol as “unspeakably huge” on his Infinity Scrapers website. He also writes out Xappol on his website.

Sources

1. Bowers, JonathanInfinity Scrapers. Retrieved January 2013.