Mathematical Double-struck Capital O Symbol
𝕆 is the Mathematical Double-Struck Capital O character (U+1D546).
U+1D546
𝕆 (U+1D546) is a double-struck, capital letter O used in specialized text. It’s common in mathematical notation where a distinctive “O” glyph is needed. Use it for copy/paste in documents, web pages, and design mockups.
Mathematical Double-struck Capital O Symbol Meaning
𝕆 is Unicode’s “MATHEMATICAL DOUBLE-STRUCK CAPITAL O” (U+1D546). The double-stroke styling distinguishes it from the regular Latin capital O and from other mathematical O variants. In practice, it’s most often used in mathematical contexts where authors want a specific symbol appearance—such as labeling sets or operators in notation conventions, or writing text that must match a particular font style. Because it belongs to the Mathematical alphanumeric symbols block, appearance depends on the font you’re using. If your font doesn’t support it, you may see a fallback or missing glyph.
Common uses
- •Typing mathematical notation that requires the double-struck “O” glyph
- •Labeling variables or symbols in math-heavy documents and worksheets
- •Designing posters or slides that include specialized mathematical typography
- •Creating consistent symbol styling in academic writing templates
- •Using the character in UI/mockups where a specific mathematical letterform is required
Examples
𝕆 Mathematical Double-Struck Capital O
- 𝕆Let 𝕆 be a set of outcomes.
- 𝕆Define 𝕆 as the set of integers with a chosen property.
- 𝕆We consider 𝕆 under the given operation.
- 𝕆The symbol 𝕆 appears in the second equation.
- 𝕆Font check: verify 𝕆 renders correctly in your document.
Variations
Ready to copy
Technical codes
| Unicode | U+1D546 | |
| HTML Entity | 𝕆 | |
| HTML Code | 𝕆 | |
| CSS | \1D546 |
FAQ
What does the Mathematical Double-struck Capital O symbol mean?
𝕆 is Unicode’s “MATHEMATICAL DOUBLE-STRUCK CAPITAL O” (U+1D546). The double-stroke styling distinguishes it from the regular Latin capital O and from other mathematical O variants. In practice, it’s most often used in mathematical contexts where authors want a specific symbol appearance—such as labeling sets or operators in notation conventions, or writing text that must match a particular font style. Because it belongs to the Mathematical alphanumeric symbols block, appearance depends on the font you’re using. If your font doesn’t support it, you may see a fallback or missing glyph.
How do I type or copy 𝕆?
Copy it directly from this page, or use its Unicode code point U+1D546 (HTML: 𝕆, CSS escape: \\1D546, JavaScript: \\u{1D546}).
Why does 𝕆 look different from a normal capital O?
𝕆 is a double-struck mathematical glyph. Its stylized stroke gives it a distinct appearance compared to the regular Latin capital O.
Will 𝕆 display correctly on all devices?
It depends on font support for the Mathematical alphanumeric symbols block. If a font lacks the glyph, you may see a fallback character.
Can I use 𝕆 in HTML or CSS?
Yes. For example, use HTML entity 𝕆 or CSS escape \\1D546 to include the character reliably when supported.