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The myriad is equal to $$10^4$$ = 10000.[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.

The outdated prefix myria- means multiplying by 10000.

10000 can be called "garhundred" using the gar- prefix.

Aarex Tiaokhiao calls this number qoodrol, 4-noogol[2], or goonaolex, and it's equal to a(10,100,0)x[2] in Aarex's Array Notation.[3]

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.[4]

## Currency-related use Edit

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 Edit

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]
Taro's multivariable Ackermann function A(3,10) A(3,11)
Pound-Star Notation #*(70)*2 #*(71)*2
BEAF {10,4}
Hyper-E notation E4
Hyperfactorial array notation 7! 8!
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 $$g_{\omega^4}(10)$$