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What is double-struck text and how do you type it?
Double-struck, or blackboard bold, letters draw some strokes as doubled lines, such as 𝔸 (U+1D538). Typing them means substituting Unicode characters for ordinary letters. Seven capitals, ℂ ℍ ℕ ℙ ℚ ℝ ℤ, come from Letterlike Symbols because mathematicians already used them for number sets, and digits have outlined forms too, from 𝟘 to 𝟡.
Double-struck example: a quiz night line
A short event line that happens to use several borrowed capitals, converted from plain text:
| Typed | Quiz Night: Round 3 starts at 8 PM |
|---|---|
| Double-Struck | ℚ𝕦𝕚𝕫 ℕ𝕚𝕘𝕙𝕥: ℝ𝕠𝕦𝕟𝕕 𝟛 𝕤𝕥𝕒𝕣𝕥𝕤 𝕒𝕥 𝟠 ℙ𝕄 |
Four of the seven substitute capitals appear in this line: ℚ, ℕ, ℝ and ℙ. The digits 3 and 8 become 𝟛 and 𝟠, and the colon stays plain.
Number sets and the seven borrowed capitals
The style is usually traced to lecturers imitating bold type on a chalkboard by doubling strokes. It became the standard notation for number sets: ℕ for the natural numbers, ℤ for the integers, ℚ for the rationals, ℝ for the reals and ℂ for the complex numbers, with ℍ for the quaternions and ℙ often used for the primes. Because those seven were already in everyday use, Unicode encoded them early, in the Letterlike Symbols block between ℂ (U+2102) and ℤ (U+2124).
When the Mathematical Alphanumeric Symbols block arrived in Unicode 3.1, the double-struck slots for C, H, N, P, Q, R and Z (U+1D53A for C, for example) were left empty to avoid duplicates, and the rest of the alphabet was placed at U+1D538-U+1D56B. The lowercase letters and the outlined digits at U+1D7D8-U+1D7E1 have no gaps.
Where outlined letters work
Double-struck text reads as display lettering rather than emphasis. It suits a gaming tag, a server or channel name, a short profile title, or a scoreboard-style line with outlined numbers. At small sizes the gap inside each doubled stroke can close up, so short words shown at a decent size look best.
Because letters and digits both convert, it is one of the few styles where a whole label such as 𝕃𝔼𝕍𝔼𝕃 𝟡𝟡 can be styled consistently. Punctuation stays plain, though, so a slash or colon between outlined characters can look thin by comparison.
Reading, searching and accessibility
All double-struck characters, including the seven borrowed capitals, normalize to plain letters and digits under NFKC, so 𝕃𝔼𝕍𝔼𝕃 𝟡𝟡 becomes LEVEL 99 in software that applies that step. Without it, the string has nothing in common with the plain words and will not match a search for them.
Screen readers may announce the borrowed capitals and the math-block letters under different names, read the line as a word, or skip characters they cannot identify. Outlined digits carry a particular risk: a phone number, price or score written with 𝟘-𝟡 may not be recognized as a number at all, so keep figures people need in ordinary digits.
Double-Struck characters at a glance
| Characters come from | Mathematical Double-Struck (U+1D538-U+1D56B, digits U+1D7D8-U+1D7E1) plus ℂ ℍ ℕ ℙ ℚ ℝ ℤ |
|---|---|
| Capital A becomes | 𝔸 (U+1D538) |
| Small a becomes | 𝕒 (U+1D552) |
| Digits 0-9 | 𝟘 𝟙 𝟚 𝟛 𝟜 𝟝 𝟞 𝟟 𝟠 𝟡 |
| Punctuation | Left unchanged |
| Basic letters left as typed | None |
| UTF-16 units per letter | 2 (one supplementary-plane code point) |
Tips for double-struck text
- Use it for short labels and names; long sentences lose the outlined effect.
- Check words containing C, H, N, P, Q, R or Z on another device, since those capitals come from a different block and may use a different font.
- Keep codes, numbers to dial and prices in plain digits.
Double-Struck text FAQ
They were encoded first, in the Letterlike Symbols block, because mathematicians used them for the complex numbers, real numbers and integers. Unicode left their slots in the math block empty, so these capitals, along with ℍ, ℕ, ℙ and ℚ, always come from the older block.
Yes. Digits 0-9 become 𝟘 to 𝟡 (U+1D7D8-U+1D7E1). Spaces, punctuation, emoji and accented letters are not changed.
No. Bold thickens every stroke, while double-struck draws some strokes as two parallel lines, giving an outlined look. They are separate Unicode alphabets with separate code points.
Unicode includes only five double-struck italic letters, ⅅ ⅆ ⅇ ⅈ ⅉ (U+2145-U+2149), used in some notations for the differential d, the number e and the imaginary unit. There is no full alphabet, so the generator does not offer that style.
Related text styles
- Bubble / Circled Text Generator: letters and digits inside circles, another outlined look
- Bold Text Generator: solid heavy letters and digits
- Monospace Text Generator: fixed-width letters and digits for a typewriter feel
- Fancy Text Generator: all 15 styles side by side
Reviewed by Raja Jahangir · Last reviewed: October 7, 2026