Why exactly was $\epsilon$ chosen to denote a very small quantity? [closed]

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I tried to search the defintion of $\epsilon$, but only got that it is the fifth letter in the Greek alphabet.

I want to know why it was chosen the way it was?

This is something not very obvious, unlike the symbol $\in$, which means element of. That makes sense because $\in$ looks like an $E$ which can stand for element.

But epsilon is just an alphabet letter, and so why was it chosen?

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