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A myriad is equal to $$10^4$$ = 10,000.[1] It was first used by the Ancient Greeks and it also has its own name in eastern Asian naming systems, although in English its name is "ten thousand". In googology, it is used in Donald Knuth's -yllion system.

In Roman numerals, it was written as ↂ or X̅.

It is also called Wan (萬or万 in Chinese) or man (まん in Japanese)[2] in Japanese and Chinese counting systems.

The outdated prefix myria- means multiplying by 10,000.

10,000 can be called "garhundred" using the gar- prefix.

Nirvana Supermind calls this number Grand zeroogol and zero-millenol, and it's equal to Q<10,zeroogol> = Q<10,1000> in quick array notation[3].

Aarex Tiaokhiao calls this number qoodrol, 4-noogol[4], or goonaolex, and it's equal to a(10,100,0)x[2] in Aarex's Array Notation.[5]

Wikia user NumLynx gave the name tetraplex for this number, coined in analogy to the tetralogue. [6]

Username5243 calls this number niloogolplex, niloogolnilex or gooquol, and it's equal to 10[0]10[0]100 = 10[1]4 in Username5243's Array Notation.[7]

DeepLineMadom calls the number boogolplex, and is equal to 10[1]10[1]100 in DeepLineMadom's Array Notation[8]. It is not to be confused with the much larger Bowers' boogolplex, which is {10,10,{10,10,100}} in BEAF.

## Currency-related use

Some currencies, such as the Japanese yen and the South Korean won, have banknotes with this number in the denomination.

Some currencies, such as the Indonesian rupiah, have commemorative coins with this number in the denomination.

Some other currencies, such as the first Turkish lira, had coins with this number in the denomination.

It is also the prize for correctly answering the first five questions in the Indian game show Kaun Banega Crorepati in Indian rupees.

Furthermore, it was also the prize for correctly answering the first question in the Japanese game show Quiz \$ Millionaire in Japanese yen.

## Approximation

Notation Lower bound Upper bound
Scientific notation $$1\times10^4$$
Arrow notation $$10\uparrow4$$
Steinhaus-Moser Notation 5[3] 6[3]
Copy notation 9[4] 1[5]
Chained arrow notation $$10\rightarrow4$$
Taro's multivariable Ackermann function A(3,10) A(3,11)
Pound-Star Notation #*(70)*2 #*(71)*2
PlantStar's Debut Notation [2] [3]
BEAF {10,4}
Hyper-E notation E4
Bashicu matrix system (0)[100]
Hyperfactorial array notation 7! 8!
Bird's array notation {10,4}
Strong array notation s(10,4)
Fast-growing hierarchy $$f_1(f_2(9))$$ $$f_2(10)$$
Hardy hierarchy $$H_{\omega^2+\omega}(9)$$ $$H_{\omega^2}(10)$$
Slow-growing hierarchy $$g_{\omega^4}(10)$$