Nobody knows for sure. Theories run from it being the letters P and S (from "pesos") superimposed over each other, to it being scrolls wrapped around two pillars.
The $ symbol pre-dates the invention of the US dollar, so some of the more US-centric theories (that Thomas Jefferson, George Washington or other Founding Fathers created it from a doodle or their initials or parts of their names) are clearly wrong.
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actually, it has 2 lines through it unlike on the keyboard where it has one. no on knows for sure
$ $ $
crowns
A division sign.
[infinty sign]<x<[infinity sign]