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HTML Entity Detail
HTML Entity - Black Letter Capital R
Black Letter Capital R is a letterlike mathematical symbols representing number sets and special functions. This HTML entity enables web developers to display this character reliably across all browsers without encoding issues.
Symbol preview
ℜ
Unicode
U+211C
HTML entity
ℜ
CSS code
\211C
Usage Examples
Use this HTML entity in mathematical notation for number sets like ℝ (real numbers) and ℕ (natural numbers), and physics constants.
Related Entities
Common Mistakes
⚠️
Mistake: Using plain Latin letters instead of double-struck symbols for number sets
Fix: Use ℝ (ℝ), ℕ (ℕ), ℤ (ℤ), ℂ (ℂ) for number sets. Plain R, N, Z, C are ambiguous and less formal in mathematical writing.
⚠️
Mistake: Confusing the aleph symbol ℵ with a Hebrew letter or a stylized N
Fix: The aleph symbol ℵ is specifically used in set theory for transfinite cardinal numbers (ℵ₀). It is not a decorative character or a substitute for the Hebrew letter.
Black Letter Capital R
Select any code to highlight it before copying.
Category: Letterlike Symbols
| Unicode | U+211C |
|---|---|
| Hex Code | ℜ |
| HTML Code | ℜ |
| HTML Entity | ℜ |
| CSS Code | \211C |
| Windows Shortcut | |
| Mac Shortcut | |
HTML code example
CSS code example
Last updated: 21 Jun 2026
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