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Undoocol or 11-noogol is equal to s(10,11) using strong array notation, or 1011 = 100,000,000,000.[1] The term was coined by Aarex Tiaokhiao. This number is known as one hundred billion in the short scale and one hundred milliard in the long scale.

He also calls this number goonaolnonault, and it's equal to a(10,100,0)x[9] in Aarex's Array Notation.[2]

Nirvana Supermind calls this number nine-ex-grand zeroogol, and is equal to Q<10,eight-ex-grand zeroogol> using quick array notation.[4]

This number has a name of उदाहरण (kharab) in Hindi language.[5]

In the German language, 100,000,000,000 is sometimes called "Zehntelbillion".

As a banknote denomination

Some currencies, such as the German Papiermark, the Hungarian pengő and the second Zimbabwean dollar, had banknotes with this number in the denomination.

Approximation

Notation Lower bound Upper bound
Scientific notation $$10^{11}$$
Arrow notation $$10\uparrow11$$
Steinhaus-Moser Notation 10[3] 11[3]
Copy notation 9[11] 10[6]
Taro's multivariable Ackermann function A(3,33) A(3,34)
Pound-Star Notation #*(1,1)*9
BEAF {10,11}
Hyper-E notation E11
Bashicu matrix system (0)(0)[562] (0)(0)[563]
Hyperfactorial array notation 14! 15!
Fast-growing hierarchy $$f_2(31)$$ $$f_2(32)$$
Hardy hierarchy $$H_{\omega^2}(31)$$ $$H_{\omega^2}(32)$$
Slow-growing hierarchy $$g_{\omega^{\omega+1}}(10)$$

Sources

Aarex's strong array notation googolisms
3-entry series
Linear array series
Golsol group: Golsol · Binary-golsol
Goolsol group: Goolsol · Uoonlsol · Booilsol · Qoonlsol
Gurea group: gurea · goourea · gigurea · guriga · guraga · durea · goodurea · guredurea · gurigedurea · duriga