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ℚ U+211A "Double‐Struck Capital Q" is from the Letterlike Symbols Unicode block.

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From a Unicode character: This is a redirect from a single Unicode character to an article or Wikipedia project page that infers meaning for the symbol. Examples would be monetary symbols like dollar and euro signs, language symbols, emoji, and so on. For a multiple-character-long title with diacritics, use template {{R from diacritic}} instead. For codes such as "U+00E6", use {{R from Unicode code}}.

From a mathematical expression: This is a redirect from a mathematical symbol or expression to a target article about the symbol or expression.

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