Bold outlined letters originally from mathematical blackboard notation.
๐ฅ๐๐ฉ๐ฅ.๐ฅ๐๐ฉ๐
Double-Struck
๐ฅ๐๐ฉ๐ฅ.๐ฅ๐๐ฉ๐
Bold Script
๐ฝ๐ฎ๐๐ฝ.๐ฝ๐ช๐๐ฒ
Elegant Script
๐โฏ๐๐.๐๐ถ๐๐พ
Small Caps
แดแดxแด.แดแดxษช
Gothic / Fraktur
๐ฑ๐ข๐ต๐ฑ.๐ฑ๐๐ต๐ฆ
Monospace
๐๐๐ก๐.๐๐๐ก๐
Fullwidth
๏ฝ๏ฝ ๏ฝ๏ฝ.๏ฝ๏ฝ๏ฝ๏ฝ
Bubble Text
โฃโโงโฃ.โฃโโงโ
Filled Circled
๐ ฃ๐ ๐ ง๐ ฃ.๐ ฃ๐ ๐ ง๐
Squared
๐ ๐ด๐ ๐ .๐ ๐ฐ๐ ๐ธ
Filled Squared
๐๐ ด๐๐.๐๐ ฐ๐๐ ธ
Strikethrough
tฬถeฬถxฬถtฬถ.ฬถtฬถaฬถxฬถiฬถ
Underline
tฬฒeฬฒxฬฒtฬฒ.ฬฒtฬฒaฬฒxฬฒiฬฒ
Double Underline
tฬณeฬณxฬณtฬณ.ฬณtฬณaฬณxฬณiฬณ
Regional Flags
๐น๐ช๐ฝ๐น.๐น๐ฆ๐ฝ๐ฎ
Upside Down
ฤฑxษสหสxวส
Stylised Block
แฆแดแญแฆ.แฆแฉแญI
Double-Struck (Blackboard Bold) uses characters from Unicode's Mathematical Alphanumeric Symbols block. These stroke-outlined letters have a unique look โ popular for stylish Twitter display names, Instagram bios, and Discord usernames.
Type your text above and the double-struck version generates instantly. Hit copy and paste the result into your Twitter display name, Instagram bio, or anywhere else. Double-struck characters look like outlined or hollow letters, giving your text a distinctive mathematical aesthetic.
Double-struck characters render on all modern devices and platforms. Seven uppercase letters (C, H, N, P, Q, R, Z) use dedicated Unicode codepoints from earlier blocks, and digits have their own double-struck range. All are widely supported on iOS, Android, Windows, and macOS.
Double-struck (also called blackboard bold) is a typographic style where each letter has a vertical line drawn through it, making it appear outlined or hollow. Mathematicians use it to denote special number sets like the real numbers or integers.
Yes. Twitter / X fully supports double-struck Unicode characters in display names and bios. The outlined style is popular with creators and brand accounts who want a distinctive profile.
Yes. This generator converts both letters and digits (0-9) into their double-struck equivalents. The number range uses Unicode codepoints U+1D7D8 through U+1D7E1.