Unicode Letter Styles
Double-Struck Letters
Outlined characters used in mathematics for number sets, and online for a clean hollow look.
𝔸𝔹ℂ 𝕒𝕓𝕔 𝟙𝟚𝟛
- Range
- U+1D538 – U+1D56B
- Note
- C, H, N, P, Q, R and Z live in Letterlike Symbols
Try Double-Struck Letters
Edit the text, then change the font and size.
About this entry
What it is
Outlined characters used in mathematics for number sets, and online for a clean hollow look.
Headings, handles and anywhere you want emphasis without weight.
Copy & use
How to copy and use double-struck letters
- 01
Copy the complete value
Use the copy button above so the value is captured without its label, description or surrounding page text.
- 02
Paste it where you need it
Headings, handles and anywhere you want emphasis without weight.
- 03
Check the final result
Styled letters are not a font applied to ordinary text. Search, screen readers, copy operations and unsupported fonts may treat them differently, so keep essential information in standard lettering.
Where it comes from
Why these characters exist
Mathematical Double-Struck, from U+1D538. These are the number sets — ℝ for the reals, ℤ for the integers — originally a blackboard convention for writing bold.
What the set is missing
Seven uppercase letters are reserved and borrowed from Letterlike Symbols: C, H, N, P, Q, R and Z. Digits exist separately from U+1D7D8.
Before you paste it
Where double-struck letters break down
The borrowed letters are the most familiar ones in the set, so a broken mapping shows up immediately. Thin outlines also disappear against a busy background. Screen readers announce these by their Unicode names or skip them, so a styled word can be read out character by character or lost entirely. Search and copy-paste also stop matching the plain spelling.
You can convert your own text into this and every other set with the fancy text generator.
Common questions
Using double-struck letters
What is double-struck letters?
Outlined characters used in mathematics for number sets, and online for a clean hollow look. Headings, handles and anywhere you want emphasis without weight.
Is double-struck letters a font or real text?
It is real text. Each letter is a separate Unicode character from U+1D538 – U+1D56B, so the styling travels with the text instead of depending on a font the reader may not have. That also means screen readers and search may not read the characters as ordinary letters, so keep the plain version nearby when the words carry meaning.
Will double-struck letters work everywhere?
Styled letters are not a font applied to ordinary text. Search, screen readers, copy operations and unsupported fonts may treat them differently, so keep essential information in standard lettering.
Can I customise double-struck letters after copying?
You can add a short label, repeat compatible symbols or trim the design to fit. Keep important spaces, line breaks and uncommon Unicode characters intact while editing.
Also known as
Keep browsing