Q
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Q  Code Point 

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The capital Latin letter Q is used in mathematics to represent the set of natural numbers. Usually, the letter is presented with a “doublestruck” typeface when it is used to represent the set of rational numbers.
The set of rational numbers is denoted with the Latin Capital letter Q presented in a doublestruck type face.
The latin letter q.
The set of natural numbers, also called the counting numbers, contains the numbers 0, 1, 2, 3, ...