U+211A "ℚ" Double-Struck Capital Q Unicode Character

U+211A "ℚ" Double-Struck Capital Q is a mathematical symbol representing the set of all rational numbers, which includes any number that can be expressed as a fraction of two integers, with the denominator not equal to zero. It belongs to the Letterlike Symbols block of Unicode and is commonly used in mathematics, particularly in number theory and algebra, to denote the field of rationals. The double-struck or blackboard bold style distinguishes it from ordinary alphabetic characters, allowing for clear notation in typesetting and mathematical discourse.