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Except $ is also the symbol for the peso. More evidence is necessary to track the first introduction of the symbol.

In the comments section of the article, someone claimed that in their Spanish-speaking country $ was used to refer to pesos, but with two bars it meant USD. So maybe the two bars in the USD was introduced to separate it from the peso when they were both common currencies.

That makes sense.

It would be better if you used evidence when choosing what you believe rather then rely on your personal preferences and biases.