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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 $$\textrm E10\#\textrm{^}\#\#10$$
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's full array on his website. However, he writes it incorrectly, giving it 11 rows instead of 10.

## Sources

1. Bowers, JonathanInfinity Scrapers. Retrieved January 2013.

Jonathan Bowers' colossol series

Tritri series: tritri · dutritri · dimentri
Xappol series: xappol · xappolplex · grand xappol
Colossol series: colossol(plex) · terossol(plex) · petossol(plex) · ectossol(plex) · zettossol(plex) · yottossol(plex) · xennossol(plex)
Saibian's extensions: goxxol · coloxxol · teroxxol · petoxxol · ectoxxol · zettoxxol · yottoxxol · xennoxxol · dimendoxxol
Tiaokhiao's extensions: killanossol · meganossol · giganossol · teranossol · petanossol · vamossol