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The goobol is equal to $$\lbrace10,100 (1) 2\rbrace = \{\underbrace{10,10 \ldots 10,10}_{100}\} = 100 \& 10$$ in BEAF.[1] The term was coined by Jonathan Bowers.

Goobol is comparable to Saibian's godgahlah.

## Approximations in other notations

Notation Approximation
Bird's array notation $$\{10,100 [2] 2\}$$ (exact)
Hyper-E notation $$\textrm{E}100 \# ^{99} 100$$
Cascading-E notation $$\textrm{E}100\#\text{^}\#99$$
Hyperfactorial array notation $$100![1,1,1,2]$$
Notation Array Notation $$(100\{5,99\}2)$$
X-Sequence Hyper-Exponential Notation $$10\{X^{98}\}100$$
Fast-growing hierarchy $$f_{\omega^{98}}(100)$$
Hardy hierarchy $$H_{\omega^{\omega^{98}}}(100)$$
Slow-growing hierarchy $$g_{\vartheta(\Omega^\omega)}(100)$$

## Sources

1. Bowers, JonathanInfinity Scrapers. Retrieved January 2013.

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