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Request of characters: needed in mathematics, geometry, etc.
′ U+2032 PRIME «Punctuation, Other» ″ U+2033 DOUBLE PRIME «Punctuation, Other» ‴ U+2034 TRIPLE PRIME «Punctuation, Other» ⁗ U+2057 QUADRUPLE PRIME «Punctuation, Other» ‱ U+2031 PER TEN THOUSAND SIGN «Punctuation, Other»