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$\begingroup$

I'm writing a paper project for school about divisibility, so I'd like to include a bit of history about that subject. I'm mostly interested in notation of $|$ sign used in past, but everything else is appreciated. I need free online literature. Thanks.

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    A bit of very modern history: the ISO 80000-2 standard (clause 2-7.17) now defines the symbol to be used as “∣” DIVIDES U+2223. It is not a particularly new character (has been in Unicode since version 1.0), and it is apparently meant to serve disambiguation, since the common “|” VERTICAL LINE has so many uses. Regarding the history of VERTICAL LINE in coded character sets (basically ASCII), check out http://www.cs.tut.fi/~jkorpela/latin1/ascii-hist.html#7C2012-04-14

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