You can replace slanted parallel symbol as unicode ⫽ (U+2AFD, Double Solidus Operator)

I had to insert parallel symbol with using MathJax.

Official unicode symbol of the "parallel" and "not parallel" signs have codepoints U+2225 (∥) and U+2226 (∦) However, what I had to make was a slanted parallel symbol, similar as // (two slashes).

existing solutions offer using some special packages, but I cannot use any special package in my work.

 

I tried to find another unicode symbol as similar as slanted parallel

Someone's blog helped me. The writer said to use ⫽ (U+2AFD), which is a Double Solidus Operator

I used this unicode symbol and figured out.

 

I think you can also use this, if you have a very bad condition as me.

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Reference: telling you to use U+2AFD. Note that this article is written in Korean.

https://blog.naver.com/lifeformula/221655536995