William oughtred
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William Oughtred(1574-1660) was the first to use the symbol for parallel.
Archimedes first used the symbol PI because he was the first one to discover it so he wanted to investigate about it.
The symbol √ for the square root was first used in print in 1525 inChristoph Rudolff's Coss, which was also the first to use the then-new signs '+' and '-'
It was a cool looking greek letter.
Mathematician Rudolph Swetchefriz{Added} The symbol is not "for" pi but is pi - one of the letters of the Greek alphabet.