Double overline is the Unicode character at U+033F in the Combining Diacritical Marks block. Official name: COMBINING DOUBLE OVERLINE. It attaches above the previous base letter — for example x̿ → x̿.
Remember
Mark (combining ̿)
Unicode U+033F
Hex entity ̿
Decimal ̿
CSS escape \033F
Named entity (none)
Related U+0305 · ‾ (‾) · U+035E
Prefer ̿ or ̿ immediately after the base letter (no named form). Use U+0305 when you need a single combining overline.
Built with Hex: x̿
Built with Decimal: x̿
Built with CSS: x̿
Typed: x̿ a̿ o̿
Compared: x̿ (double) vs x̅ (single)
How It Works
1. Hex: write the base letter, then ̿ → x̿. Preferred when there is no named entity.
2. Decimal: same code point as 831 → ̿ after the base letter. Same result as hex.
3. CSS: use \033F in content after a letter in the string (not an HTML entity). #point::after appends x̿.
4. Typed / compared: paste the combining mark after a letter in UTF-8, or contrast U+033F (double) with U+0305 (single).
Pitfalls & Tips
Common mistakes when working with Double Overline.
Order
Base letter first
Write x̿, not ̿x. Combining marks attach to the previous character.
U+0305
Not a single overline
For one combining overline above a letter, use U+0305. U+033F is the double form.
‾
Not ‾
‾ is the spacing mark U+203E (‾). It does not combine with a letter the way U+033F does.
U+035E
Not double macron
U+035E is combining double macron — a related double bar above, but a different code point from overline.
Name
No named entity
There is no &doubleoverline; for U+033F. Use ̿ or ̿.
CSS vs HTML
Do not mix escapes
\033F belongs in CSS strings. ̿ / ̿ belong in HTML after a base letter.
Fonts
Diacritic font coverage
Some fonts omit U+033F. Prefer a font with Combining Diacritical Marks coverage for display.
Compatibility
Browser Support
Combining double overline (U+033F) and its entity forms (̿, ̿, CSS \\033F) are supported in all mainstream browsers. Visible positioning depends on font diacritic coverage.
✓ Universal support
Double Overline (U+033F)
Encode with hex, decimal, CSS escape, or type the combining mark after a letter — same code point everywhere encoding is supported.
100%Browser coverage
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerAll versions
Yes
U+033F / entitiesFull support
Bottom line: Prefer ̿ after a base letter (no named form). Use \\033F only inside CSS content.
Remember
Key Takeaways
Unicode: combining double overline is U+033F (decimal 831).
HTML: no named entity — use base + ̿ / ̿, or type the mark after a letter.
CSS: use a letter + \033F inside content.
Meaning: double overline above — not U+0305 (single), spacing ‾, or U+035E (double macron).
One line:U+033F → base + ̿ / ̿ / CSS \033F.
Frequently Asked Questions
Place ̿ (hex) or ̿ (decimal) after a base letter, type the combining mark in UTF-8 after a letter, or use CSS \033F in content after a letter. There is no named HTML entity for U+033F.
U+033F (COMBINING DOUBLE OVERLINE). Hex 033F, decimal 831. It belongs to the Combining Diacritical Marks block (U+0300–U+036F).
No. Use numeric forms ̿ or ̿ after a base character. The spacing overline ‾ uses ‾ (U+203E) — a different character.
Use it in math, linguistics, or notation when you need a double overline above a letter. Prefer U+0305 for a single combining overline, and ‾ (‾) for a spacing overline alone.
HTML entities (̿ or ̿) go in markup after a base letter. The CSS escape \033F goes in stylesheet strings (usually content on ::before/::after, after a letter in the string).
No. U+033F is combining double overline. U+0305 is a single combining overline. ‾ is the spacing overline U+203E (‾). U+035E is combining double macron (a related but different double bar above).
🤔
Did you know?
Double overline is Unicode U+033F (decimal 831) — a combining mark (COMBINING DOUBLE OVERLINE) in the Combining Diacritical Marks block. There is no HTML5 named entity; use ̿ or ̿ after a base letter (e.g. x̿ → x̿). Single combining overline is U+0305. Spacing overline is U+203E (‾).
