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The giggolplex is equal to {10,giggol,2} in BEAF, or 10 tetrated to the giggol. Thus, it is equal to 1010...1010, where there are giggol tens.[1] The term was coined by Jonathan Bowers.

Giggolplex is also called hectalogialogue by Sbiis Saibian, and equal to E1#giggol = E1#(E1#100) = E1#100#2 in Hyper-E notation.[2]

Aarex Tiaokhiao calls this number giggolduex.[3]

Username5243 calls this number doogolplex and doogolduex.[4]

Binary198 calls this number doobol (double+googol), and it's equal to {10, 0, 1 (1) 10, 0, 1 (1) 100, 0, 1} = {10, {10, 100, 1}, 1} in BIP-array Notation.[5]

## Etymology

The name of the number is based on suffix -plex and the number giggol.

## Approximations in other notations

Notation Approximation (or exact value)
Up-arrow notation $$10 \uparrow\uparrow (10 \uparrow\uparrow 100)$$ (exact)
Hyper-E notation $$\textrm{E}1\#100\#2$$ (exact)
Chained arrow notation $$10 \rightarrow (10 \rightarrow 100 \rightarrow 2) \rightarrow 2$$ (exact)
Hyperfactorial array notation $$(102!1)!1$$
Fast-growing hierarchy $$f^2_3(98)$$
Hardy hierarchy $$H_{(\omega^3) 2}(100)$$
Slow-growing hierarchy $$g_{\varepsilon_{\varepsilon_0}}(100)$$

## Sources

1. Bowers, JonathanInfinity Scrapers. Retrieved January 2013.
2. Saibian, Sbiis. 4.3.2 - Hyper-E Notation - Large Numbers. Retrieved 2016-08-04.
3. Username5243. Part 1 - My Large Numbers. Retrieved 2017-01-15.
4. A mathematical journey, retrieved 2021-09-23
5. DeepLineMadom's googology - Numbers I've coined (Retrieved 4 May 2022)

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