0x0000211D

0x0000211D is a hexadecimal literal that corresponds to the Unicode code point U+211D, which is the Real Number Symbol ℝ. In Unicode terminology, the character name is REAL NUMBER SYMBOL, and it is commonly used to denote the set of real numbers in mathematics and related disciplines.

In terms of encoding, 0x211D identifies the same character across systems that reference Unicode code points by hexadecimal notation. In UTF-8, U+211D is encoded as the three-byte sequence E2 84 9D; in UTF-16, it appears as the surrogate pair D835 DD1D. Many programming languages support escapes for this character, such as \u211D (in languages that use four-hex-digit escapes) or \U0000211D for eight-hex-digit escapes. Web pages can reference it directly in UTF-8 using the character ℝ or via numeric entity ℝ.

Usage and implications: The symbol ℝ is widely used in mathematics, physics, and related fields to represent the set of real numbers. It appears in formulas, notation for real-valued functions, and discussions of continuity, limits, and measure theory. In digital text and typesetting, rendering ℝ depends on font coverage; not all fonts include the glyph, making font choice important for correct display.

See also: Unicode code points and encoding, real numbers, mathematical symbols, and character representations in programming and typesetting.