x211D

x211D is the hexadecimal notation often used to refer to the Unicode code point U+211D. This code point is assigned to the mathematical symbol ℝ, the double-struck capital R.

In Unicode, the character is named MATHEMATICAL DOUBLE-STRUCK CAPITAL R and is part of the Letterlike Symbols block. The symbol is used in mathematics to denote the set of real numbers, continuing the tradition of writing real numbers in a double-struck style on blackboards.

Encoding information for x211D: U+211D can be encoded in UTF-8 as E2 84 9D; in UTF-16 as the single code unit 0x211D; and in UTF-32 as 0x0000211D. In HTML, the character can be represented by the numeric character reference ℝ or the decimal form ℝ.

Usage considerations: Rendering depends on font support. Many math-focused fonts provide a proper double-struck R, while some environments render a regular R or an approximate glyph. The symbol is widely recognized in mathematical literature and digital documents to denote the set of real numbers.

See also: U+211D, Blackboard bold, Letterlike Symbols.