U+1D563 "𝕣" Mathematical Double-Struck Small R Unicode Character

U+1D563 "𝕣" Mathematical Double-Struck Small R is a glyph from the Mathematical Alphanumeric Symbols block, designed to represent the lowercase letter 'r' in a double-struck, or blackboard bold, typeface. This style is commonly used in mathematical notation to denote specific number sets or algebraic structures, such as the real numbers when paired with capital R, though the lowercase version often appears in specialized contexts like linear algebra or vector notation. Part of a larger set of double-struck letters, this character enables clear and distinct visual representation in academic and technical writing, particularly in digital formats where Unicode provides a standardized alternative to font-based formatting.