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"Penoogol" redirects here. It is not to be confused with pentoogol.
Not to be confused with Giggol.

Gigol (formerly gygol[1]) is equal to $$\{10,100,5\}$$ in BEAF, which is 10 heptated to 100.[2] The number was coined by Jonathan Bowers.

This number is also called hecta-exaxis (formerly hecta-exaksys) by Sbiis Saibian, and it's equal to E1#1#1#1#100 in Hyper-E notation.[3]

Username5243 calls this number Penoogol, and it's equal to 10[5]100 in Username5243's Array Notation.[4]

It is pronounced with the long "i" like the word "I".

## Approximations

Notation Approximation
Chained arrow notation $$10 \rightarrow 100 \rightarrow 5$$ (exact)
Arrow notation $$10 \uparrow \uparrow \uparrow \uparrow \uparrow 100$$ (exact)
Hyperfactorial array notation $$102!4$$
Strong array notation s(10,100,5) (exact)
Fast-growing hierarchy $$f_6(100)$$
Hardy hierarchy $$H_{\omega^6}(100)$$
Slow-growing hierarchy $$g_{\varphi(4,0)}(100)$$

## Sources

1. Archive of Infinity Scrapers at 2002
2. Bowers, JonathanInfinity Scrapers. Retrieved January 2013.
3. Saibian, Sbiis. Hyper-E Numbers. Retrieved 2015-04-10.
4. Username5243. Shortened listMy Large Numbers. Retrieved 2017-05-02.

Jonathan Bowers' googol series

Googol series: googol(plex/duplex/triplex/quadraplex/quinplex) · giggol(plex/duplex) · gaggol(plex/duplex) · geegol(plex) · gigol(plex) · goggol(plex) · gagol(plex)
Boogol series: boogol(plex/duplex/triplex) · biggol(plex/duplex) · baggol(plex) · beegol(plex) · bigol · boggol · bagol
Troogol series: troogol(plex/duplex) · triggol(plex/duplex) · traggol(plex/duplex) · treegol · trigol · troggol · tragol
Quintoogol series: quintoogol(plex) · quintiggol · quintaggol · quinteegol · quintigol · quintoggol · quintagol · (sextoogol · septoogol · octoogol)
Goobol series: goobol(plex) · gibbol · gabbol · geebol · gibol · gobbol · gabol
Boobol series: boobol · bibbol · babbol · beebol · bibol · bobbol · babol
Troobol series: troobol · tribbol · trabbol