0x211A

0x211A is the hexadecimal code point that corresponds to the Unicode character U+211A. This character is part of the Letterlike Symbols block and is commonly rendered as a double-struck or blackboard-bold capital Q (ℚ). In mathematical contexts, this symbol is widely used to denote the set of rational numbers.

In mathematics, the symbol ℚ stands alongside other letterlike symbols such as ℕ (natural numbers), ℤ (integers), and ℝ (real numbers) to represent standard number sets. The convention to use a double-struck or blackboard-bold style arose to visually distinguish these sets from individual variables. In typesetting, mathematicians often write the rational numbers as \mathbb{Q} in LaTeX, which requires the amsfonts or amssymb package; when using Unicode, many fonts can render U+211A directly as ℚ.

Encoding and rendering considerations: U+211A belongs to the Unicode Letterlike Symbols block (U+2100–U+214F). It can be referenced in HTML or XML with a numeric character reference such as ℚ. Font support varies: some environments render a standard Q, while others provide a more authentic double-struck appearance. In contexts where the glyph is not available, authors may use an alternative notation or image to convey the same mathematical meaning.