Mathematical Sans-Serif Capital O 𝖮
Visual Description: The character is a clean, rounded O with a uniform, sans serif stroke. It looks geometric and modern, without extra decoration. The line is even in width and smooth in curvature. In many fonts it appears as a simple ring suitable for math notation and UI labels.
Meaning & Usage: The O stands for a variable, a label, or a constant in equations and identifiers. It is used when a letter must be readable in formulas. In UI it can appear on buttons or badges to indicate options or categories. It helps distinguish styled letters from plain text.
Historical Background: This kind of letter variant grew from efforts to separate mathematical notation from body text. It is part of a larger family used to keep symbols distinct across fonts and devices. Unicode and font designers provide such characters so software can display consistent mathematics without distortion.
Practical Use: In calculations, this O can label a variable or a target value in formulas. It appears in calculators as a readable symbol for options or comparisons. In quick UI, you might see it on toggles, sliders, or keypad shortcuts to emphasize a variable, constant, or open criterion without clutter.
See our category page for related symbols.
Look‑alikes: O (U+4F).
Need styled alternatives? Try the Fancy Text tool.
Confusables
Technical details
- Codepoint:
U+1D5AE - General Category:
Lu - Age:
3.1 - Bidi Class:
L - Decomposition:
<font> 004F - Block:
Mathematical Alphanumeric Symbols - Script:
Common - UTF-8:
F0 9D 96 AE - UTF-16:
D835 DDAE - UTF-32:
0001D5AE - HTML dec:
𝖮 - HTML hex:
𝖮 - JS escape:
\u{1D5AE} - Python \N{}:
\N{MATHEMATICAL SANS-SERIF CAPITAL O} - Python \U:
\U0001D5AE - URL-encoded:
%F0%9D%96%AE - CSS escape:
\1D5AE
How to type / insert
Fast copy: click the Copy button near the top of this page.
By codepoint: in many editors and IDEs, you can insert via the Unicode code U+1D5AE or a built‑in character picker.
HTML: use the numeric entity 햮 (hex) or 햮 (decimal) when an HTML entity is needed.
Compatibility & troubleshooting
Font support: if the symbol does not render, the current font likely lacks this codepoint. Choose a font with broad Unicode coverage or allow a fallback font.
Web pages: ensure your CSS font stack includes a general fallback; avoid relying on images for common symbols to preserve accessibility and copyability.