Reminds me of the physics proof in class that used lowercase delta, partial derivative d, d, and scripty d. I think it also had about three different types of r. Sadly, the professor's handwriting wasn't quite good enough to actually tell the things apart.
Or a math professor of mine who used X, x, Χ, χ,(upper- and lower-case chi), some sort of bold/script X, × (multiplication), as well as lowercase ts that were slanted into x-ish-ness all at once.
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