What Is a Double Struck Font Generator?
A double struck font generator is a Unicode text converter that maps each letter and digit to its Mathematical Double-Struck character, so text looks like hollow, outlined blackboard bold. The same tool goes by double struck text generator, blackboard bold generator, double struck letters generator, outline font generator and double strike text generator.
How Double-Struck Text Works
Double-struck letters live in 2 Unicode blocks. The Mathematical Alphanumeric Symbols block holds capitals from 𝔸 (U+1D538), small letters from 𝕒 (U+1D552) and digits from 𝟘 (U+1D7D8). 7 capitals came earlier in the Letterlike Symbols block, so Unicode skips them in the math block: ℂ (U+2102), ℍ (U+210D), ℕ (U+2115), ℙ (U+2119), ℚ (U+211A), ℝ (U+211D) and ℤ (U+2124). The generator picks the correct code point for every letter, including these 7.
How to Use the Double Struck Font Generator
To use the double struck font generator, type your words, copy the double-struck style, and paste it. The process takes 4 steps:
- Type your words or numbers in the box at the top.
- Find the Double Struck style, or a framed version such as 『 ℕ𝕒𝕞𝕖 』.
- Tap Copy on the style.
- Paste the double-struck text into a bio, a post, a chat or a document.
Double Struck Alphabet and Numbers
Here is the full double struck alphabet, ready to copy letter by letter:
- Capitals A to Z
𝔸 𝔹 ℂ 𝔻 𝔼 𝔽 𝔾 ℍ 𝕀 𝕁 𝕂 𝕃 𝕄 ℕ 𝕆 ℙ ℚ ℝ 𝕊 𝕋 𝕌 𝕍 𝕎 𝕏 𝕐 ℤ - Small letters a to z
𝕒 𝕓 𝕔 𝕕 𝕖 𝕗 𝕘 𝕙 𝕚 𝕛 𝕜 𝕝 𝕞 𝕟 𝕠 𝕡 𝕢 𝕣 𝕤 𝕥 𝕦 𝕧 𝕨 𝕩 𝕪 𝕫 - Numbers 0 to 9
𝟘 𝟙 𝟚 𝟛 𝟜 𝟝 𝟞 𝟟 𝟠 𝟡
The 7 capitals ℂ, ℍ, ℕ, ℙ, ℚ, ℝ and ℤ come from an older block, so some fonts draw them slightly bolder or narrower than the rest.
What Double-Struck Letters Mean in Math
Double-struck letters name the main number sets in mathematics. Here are 10 standard meanings:
| Letter | Meaning |
|---|---|
| ℕ | Natural numbers: 0 or 1, 2, 3 and so on |
| ℤ | Integers, from the German word Zahlen (numbers) |
| ℚ | Rational numbers, from quotient |
| ℝ | Real numbers |
| ℂ | Complex numbers |
| ℍ | Quaternions, after William Rowan Hamilton |
| ℙ | Prime numbers, or projective space |
| 𝔽 | A field, such as the finite field 𝔽₂ |
| 𝔼 | Expected value in probability |
| 𝟙 | Indicator function |
Where Blackboard Bold Comes From
Blackboard bold comes from the classroom: lecturers drew bold letters on blackboards by doubling one stroke of each letter. The name double-struck comes from typewriters, where typing a letter twice with a small shift gave a heavier, doubled look. Printed math books adopted the style for number sets, and Unicode 3.1 added the full double-struck alphabet in 2001 as part of the Mathematical Alphanumeric Symbols block.
Double-Struck Symbols Beyond A to Z
Unicode holds 10 more double-struck characters outside the main alphabet:
- Greek letters: ℼ (pi), ℽ (gamma), ℾ (capital gamma), ℿ (capital pi)
- Summation: ⅀ (double-struck n-ary summation)
- Italic letters: ⅅ ⅆ ⅇ ⅈ ⅉ, used for the differential d, Euler number e and imaginary units i and j
How to Type Double-Struck Letters in LaTeX, Word and Google Docs
To type double-struck letters in a document, use the math command of each tool, or paste letters from this page. Here are 4 methods:
- LaTeX: write
\mathbb{R}with the amssymb package. - Microsoft Word: open an equation (Alt + =) and type
\doubleR, then a space. - Google Docs: open Insert › Special characters and search for double-struck, or paste the letters.
- HyperText Markup Language (HTML): use named entities such as
ℝfor ℝ,ℕfor ℕ andℤfor ℤ.
Where Double Struck Text Works
Double struck text works in names, bios, captions and messages on Instagram, X (Twitter), TikTok, Discord, Facebook, Reddit, YouTube and Twitch. The X logo itself resembles the double-struck capital 𝕏, so many accounts use it in display names, and the X fonts page covers that use. Usernames and @handles accept plain letters only. A few older phones lack the math block and show boxes in place of the letters.
Is Double Struck the Same as Double Strikethrough?
No, double-struck letters are outlined letters, while double strikethrough is 2 lines drawn through text. Searches for a double strike text generator usually mean one of the 2. Double strikethrough is a Microsoft Word option in the Font dialog, and copy and paste strike lines are on the strikethrough text generator page.
Free Double Struck Font for Names, Math and Headings
A double struck font generator gives you blackboard bold letters and numbers that copy and paste anywhere, with the correct ℂ, ℍ, ℕ, ℙ, ℚ, ℝ and ℤ. Use double-struck text for clean names, headings and stats, and the LaTeX, Word and HTML codes for math documents. Every double struck style on FontGlint is free.
Frequently Asked Questions
Is the double struck font generator free?
Yes, the double struck font generator is free, with no download or sign-up.
Is double struck the same as blackboard bold?
Yes, double struck and blackboard bold are 2 names for the same outlined letter style.
Are there double struck numbers?
Yes, Unicode has double-struck digits 𝟘 to 𝟡, and the generator converts numbers automatically.
Does double struck text work in Google Docs?
Yes, pasted double-struck letters work in Google Docs, and the Special characters search finds single letters.
Is there a double struck font on DaFont?
Yes, DaFont and other font sites list outline and inline fonts with a double-struck look, and those need an install, while Unicode letters from this page need none.
Why do ℂ and ℝ look slightly different from 𝔸?
ℂ and ℝ come from the older Letterlike Symbols block, so some fonts draw them in a different weight from the math block letters.