SymbolHub

Real Numbers Symbol (ℝ)

The real numbers symbol ℝ is Unicode U+211D, the blackboard-bold R for the real numbers. Press Copy to put it on your clipboard.

Unicode
U+211D
HTML
ℝ
Word
211D Alt+X

How to type the real numbers symbol (ℝ)

The quickest way is to press Copy above and paste. To type ℝ yourself, use the method for your device below.

Windows

  1. In Word or Outlook, type 211D and press Alt + X. Alt + X converts the hex code before the cursor into the character, and back again.
  2. Press Win + R, type charmap and press Enter. Tick “Advanced view”, search for Double-Struck Capital R, then Select and Copy. Character Map is built into every version of Windows.

Mac

  1. Press Control + Command + Space to open the Character Viewer, search for double-struck capital r and double-click it.
  2. With the Unicode Hex Input keyboard enabled (System Settings → Keyboard → Input Sources), hold Option and type 211D.

Linux & ChromeOS

  1. Press Ctrl + Shift + U, type 211d, then press Enter or Space. Works in GTK and IBus apps (GNOME, Firefox, Chrome, LibreOffice) and on ChromeOS.

iPhone & iPad

  1. Copy ℝ from this page, then go to Settings → General → Keyboard → Text Replacement and add it with a shortcut such as ;real. The shortcut then turns into the symbol as you type, in every app.

Android

  1. Copy ℝ here, then open Gboard settings → Dictionary → Personal dictionary and add it with a shortcut.

Microsoft Word

  1. Type 211D, then press Alt + X.
  2. Insert → Symbol → More Symbols. Set “from” to Unicode (hex), type 211D in “Character code” and click Insert.

Google Docs

  1. Insert → Special characters, then search for “double-struck capital r” or draw it in the box.

Excel & Google Sheets

  1. Enter =UNICHAR(8477) in a cell. It works in Excel 2013 and later and in Google Sheets.

HTML

  1. Write ℝ or ℝ in your HTML.

What does ℝ mean?

ℝ denotes the set of real numbers, every point on the number line, including fractions and irrationals such as √2 and π. The double-struck style began as the way lecturers wrote bold letters on a blackboard and became standard in print. Powers describe spaces: ℝ² is the plane, ℝ³ ordinary space. The character sits in the Letterlike Symbols block rather than the mathematical alphabets, which is why it displays in most fonts.

Common uses

  • Domains of functions: f: ℝ → ℝ
  • Vector spaces: ℝⁿ

Real Numbers Symbol codes for HTML, CSS and programming

Every code below produces ℝ. Use the HTML entity in web pages, the CSS escape in content, and the escape sequence in source code.

Unicode code pointU+211D
HTML entity (named)ℝ
HTML decimalℝ
HTML hexℝ
CSS contentcontent: "\211D";
JavaScript"\u211D"
Python"\u211D"
Python (by name)"\N{DOUBLE-STRUCK CAPITAL R}"
Java / C#"\u211D"
LaTeX\mathbb{R}
UTF-8 bytesE2 84 9D
UTF-16211D
URL encoded%E2%84%9D

ℝ vs look-alike characters

These characters look similar to ℝ but have a different meaning and code. Pasting the wrong one can break search, sorting and screen readers.

CharNameWhen to use it
Capital R
U+0052		The plain capital letter, which should be bold or double-struck for the set.
Script Capital R
U+211B		Script capital R, used for other quantities.

Symbols similar to ℝ

Click to copy, or open a symbol for its codes. See the full math symbols collection.

ℝ character properties

Official Unicode name
DOUBLE-STRUCK CAPITAL R
Also known as
double-struck r, blackboard bold r, set of real numbers
Code point
U+211D
Unicode block
Letterlike Symbols (U+2100–U+214F)
General category
Uppercase letter (Lu)
Added in
Unicode 1.1 (1993)
Plane
Basic Multilingual Plane (0)
Emoji
No, it is a text symbol

Frequently asked questions

What do ℕ, ℤ, ℚ, ℝ and ℂ stand for?

Natural numbers, integers (from German Zahlen), rationals (quotients), reals and complex numbers. Each set contains the one before it.

Is there an alt code for the real numbers symbol?

No. ℝ is outside the Windows-1252 and code page 437 character sets, so no Alt + number code produces it. Copy it from this page, type 211D then Alt + X in Word, or find it in Character Map.

How do I type the real numbers symbol on a Mac?

There is no single Option shortcut for ℝ on the US layout. Press Control + Command + Space to open the Character Viewer, search for “double-struck capital r” and double-click it, or copy it from this page.

What is the HTML code for the real numbers symbol?

Use the named entity ℝ or the numeric reference ℝ (hex ℝ). All three display ℝ in every browser.

What is the Unicode for the real numbers symbol?

ℝ is U+211D, officially named DOUBLE-STRUCK CAPITAL R, in the Letterlike Symbols block. It has been part of Unicode since version 1.1 (1993).