Character Sets
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### Web resources

[Mathematical operators and symbols in Unicode - Wikipedia](https://en.wikipedia.org/wiki/Mathematical_operators_and_symbols_in_Unicode)

[List of logic symbols - Wikipedia](https://en.wikipedia.org/wiki/List_of_logic_symbols)

[Arrows (Unicode block) - Wikipedia](https://en.wikipedia.org/wiki/Arrows_%28Unicode_block%29)

[Unicode subscripts and superscripts - Wikipedia](https://en.wikipedia.org/wiki/Unicode_subscripts_and_superscripts)

[Glossary of mathematical symbols - Wikipedia](https://en.wikipedia.org/wiki/Glossary_of_mathematical_symbols)

[Greek alphabet - Wikipedia](https://en.wikipedia.org/wiki/Greek_alphabet)

[A Spectre is Haunting Unicode](https://www.dampfkraft.com/ghost-characters.html) ★★

[ASCII and Unicode quotation marks](https://www.cl.cam.ac.uk/~mgk25/ucs/quotes.html) ★

[Historical: How was Chinese written in telegrams and early computers?](https://chinese.stackexchange.com/questions/30725/historical-how-was-chinese-written-in-telegrams-and-early-computers) ★

[Japanese rebus monogram - Wikipedia](https://en.wikipedia.org/wiki/Japanese_rebus_monogram)