A dollar sign has TWO lines going through it. The one on your keyboard IS NOT the dollar sign, it is another symbol called an "OFFSET" .
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The usual symbol for a pound Sterling had two cross lines when the amount was handwitten, but the keyboards of computers (and the modern banknotes) only use one cross line.
exactly one
one
In plane geometry there is exactly one straight line through two points. There can be any number of curved lines.
1, going horizontally through the DOnly one line. A horizontal line through the middle of the letter D.