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The gibbol is equal to $$\{10,100,2 (1) 2\} = \{\underbrace{10,10,10,10,10.....10,10,10,10,10}_{\{10,99,2 (1) 2\}\text{ 10's}}\}$$ in BEAF.[1] The term was coined by Jonathan Bowers.

## Approximations and exact values in other notations

Notation Approximation
Bird's array notation $$\{10,100,2 [2] 2\}$$ (exactly equal)
Cascading-E notation $$E100\#\text{^}\#100\#100$$
Hyperfactorial array notation $$100![2,1,1,2]$$
X-Sequence Hyper-Exponential Notation $$10\{X^X+1\}100$$
Fast-growing hierarchy $$f_{\omega^{\omega}+1}(100)$$
Hardy hierarchy $$H_{\omega^{\omega^{\omega}+1}}(100)$$
Slow-growing hierarchy $$g_{\vartheta(\Omega^\Omega)}(100)$$
Aarex's array notation $$\lbrace 10,100,2 ; 2 \rbrace$$[2]

## Sources

1. Bowers, JonathanInfinity Scrapers. Retrieved January 2013.
2. Aarex's Large Numbers

Jonathan Bowers' googol series

Googol series: googol(plex/duplex/triplex/quadraplex) · 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(plex) · boggol(plex) · bagol(plex)
Troogol series: troogol(plex/duplex) · triggol(plex) · traggol(plex) · treegol(plex) · trigol(plex) · troggol(plex) · tragol(plex)