Set of Rational Numbers Symbol
The set of rational numbers is denoted with the Latin Capital letter Q presented in a doublestruck type face. It is part of a family of symbols, presented with a doublestruck type face, that represent the number sets used as a basis for mathematics.
Symbol  Format  Data 

ℚ  Unicode 

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Usage
Set of Rational Numbers  Concept
The set of rational numbers can be defined by the quotient of two numbers belonging to the set of integers, where the divisor is nonzero.