What is the meaning of this arg() function

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Can someone help me to clarify this equation: $$g^{*}=arg\left(\sum_{g=0}^{255}h(g) > \delta N\right)$$

• where h(g) is the amount at gray level g
• threshold $g^{*}$
• $\delta=0.99$
• N is total number of pixel

Everything is accorded to this doc (equation(14))

Btw, I'm only known of argmax, argmin

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