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From Wiktionary, the free dictionary

U+211A, ℚ
DOUBLE-STRUCK CAPITAL Q

[U+2119]
Letterlike Symbols
[U+211B]

𝐐 U+1D410, 𝐐
MATHEMATICAL BOLD CAPITAL Q
𝐏
[U+1D40F]
Mathematical Alphanumeric Symbols 𝐑
[U+1D411]

Translingual

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Alternative forms

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Etymology

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From 𝐐, from the initial of Italian quoziente (quotient), a notation proposed in 1895 by mathematician Giuseppe Peano. The usage of blackboard bold dates to the 1960s.

Symbol

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  1. (mathematics) Alternative form of 𝐐, the set of rational numbers.
    Synonym: