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The gigangol (short for 'gigantic googol') is equal to E100#100#100#100 using Hyper-E notation.[1][2] Gigangol is comparable to Bowers' geegol. The term was coined by Sbiis Saibian.

This number is also called tetowergol by Aarex Tiaokhiao.[3]

It can be shown that $$\text{gigangol} > \text{geegol} \uparrow\uparrow\uparrow \text{geegol}$$.

## Approximations in other notations

Notation Approximation
Up-arrow notation $$100 \uparrow\uparrow\uparrow\uparrow 101$$
Chained arrow notation $$100 \rightarrow 101 \rightarrow 4$$
BEAF $$\{100,101,4\}$$
Hyperfactorial array notation $$102!3$$
Fast-growing hierarchy $$f_5(100)$$
Hardy hierarchy $$H_{\omega^5}(100)$$
Slow-growing hierarchy $$g_{\eta_0}(100)$$

## Sources

1. Saibian, Sbiis. Hyper-E Numbers. Retrieved 2015-04-02.
2. Sbiis Saibian's Ultimate Large Numbers List

Googol and related numbers

Originals: googol · googolplex
Cockburn's examples: gargoogolplex · fzgoogolplex · (mega)fugagoogolplex
Googol-n-plex: googolduplex · googoltriplex · -quadriplex · -quinplex · -sextiplex · -septiplex · -octiplex · -noniplex · -deciplex · -centiplex
Googol-103n-plex: googolmilliplex · -megaplex · -gigaplex · -teraplex · -petaplex · -exaplex · -zettaplex · -yottaplex · -xennaplex · -vekaplex · -mekaplex
Bowers' extensions: giggol · gaggol · geegol · boogol · biggol · troogol · goobol · more...
Saibian's extensions: googol-minutia · googolchime · googoltoll · googolgong · grangol · greagol · gigangol · gugold · graatagold · gugolthra · throogol · godgahlah · tethrathoth · more...
Miscellany: googolbang (10100!) · googolminex (10^-10100) · googolteen · googolty · great googol(plex) · gooprol · little googol/googolbit · zootzootplex

Googol — Greagol
Greagol — Gugold
Throogol — Godgahlah-ex-grand godgahlah