When I was a child, I learned Roman numerals before I learned about the dollar sign. When I first encountered a dollar sign, I interpreted it as an “S” with a Roman numeral one superimposed over it. It then followed (I thought at the time) that the symbols for $2 through $10 would look like those shown above.
Fortunately, it didn’t take long before I figured out this would be impractical. I certainly would not want to have to write the symbol for $3,978, after all.