William Oughtred(1574-1660) was the first to use the symbol for parallel.
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William oughtred
It wasn't an English man but it was a Welsh mathematician by the name of Robert Recorde who in 1557 invented the equality symbol and it has 2 equal parallel lines
Pythagoras was the 1st person who used the pi symbol first
"why" is not a mathematical symbol.
It should have a three horizontal parallel lines but often the ordinary equality symbol "=" is used.