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Real Numbers Symbol (Double-Struck R) (ℝ)
ℝ is the blackboard-bold R naming the set of all real numbers — every value on the number line.
Real Numbers Symbol (Double-Struck R) codes
| Code | Value |
|---|---|
| Unicode code point | U+211D |
| Unicode name | Double-Struck Capital R |
| HTML named entity | ℝ |
| HTML decimal | ℝ |
| HTML hex | ℝ |
| CSS content code | \211D |
| JavaScript / JSON | \u211D |
| Windows Alt code | No standard Alt code — copy it from the card above |
| LaTeX | \mathbb{R} |
Real Numbers Symbol (Double-Struck R) variants (6)
6 related glyphs — click any tile to copy it. Tiles with a page open that symbol's own page.
Meaning & usage
ℝ is the blackboard-bold R naming the set of all real numbers — every value on the number line. Its family names the other great sets: ℕ naturals, ℤ integers, ℚ rationals, ℂ complex. Mathematicians once chalked bold letters by doubling strokes; printers turned the habit into these double-struck characters.
Examples in use
- Copy ℝ into a post, document or message
How to type the real numbers symbol (double-struck r)
Windows
There is no Alt code or direct key for ℝ. In Microsoft Word, type 211D and press Alt+X to convert it. Everywhere else, click the Copy button at the top of this page and paste it (Ctrl+V) — that always works.
Mac
There is no Option-key shortcut for ℝ on a Mac. Open the Character Viewer with Control+Command+Space, search for "Real Numbers Symbol (Double-Struck R)", and double-click to insert — or copy it from this page.
iPhone & Android
Most phone keyboards have no built-in key for ℝ. Open this page on your phone, tap Copy, then paste it into your message or bio. (On Android, Gboard's emoji search finds some symbols by name.)
Linux
Press Ctrl+Shift+U, type 211d and press Enter (works in most GTK apps and terminals with IBus). Or copy it from this page.
Frequently asked questions
How do I copy the ℝ symbol?
Click the big ℝ in the card at the top of this page — it copies as a standard Unicode character (U+211D) and pastes anywhere.
How do I type ℝ on a keyboard?
There is no standard keyboard shortcut or Alt code for ℝ. Copy it from this page, or in Microsoft Word type 211D and press Alt+X.
Why does ℝ sometimes show as a box or question mark?
The box (called tofu) means the device or font viewing it has no drawing for U+211D (Double-Struck Capital R). The character itself is fine — try a different font or a newer device, or use one of the variants on this page.
Is the Real Numbers Symbol (Double-Struck R) free to use?
Yes. ℝ is a standard Unicode text character published in the Unicode Character Database. You may use it in personal and commercial documents, designs and products without permission or payment.
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Data: Unicode Character Database · Page updated 2026-11-13