Lowercase o with double acute (ő) is the Unicode character at U+0151 in Latin Extended-A. Official name: LATIN SMALL LETTER O WITH DOUBLE ACUTE — the letter o with two acute accents. It is a core letter in Hungarian.
Remember
Character ő
Unicode U+0151
Named entity ő
Hex entity ő
Decimal ő
CSS escape \0151
Capital Ő (Ő)
Not the same o · ö (ö) · ó (ó)
Prefer ő in HTML. Alternatives: ő, ő, or type ő in a UTF-8 document.
Built with Named: ő
Built with Hex: ő
Built with Decimal: ő
Built with CSS: ő
Typed: ő
Hungarian: hős, fő, cső
How It Works
1. Named:ő is the HTML5 name for U+0151 → ő. Prefer this in markup.
2. Hex:ő inserts the same code point. Same visual as named.
3. Decimal: same code point as 337 → ő.
4. CSS: use \0151 in content (not an HTML entity). #point::after appends ő.
5. Typed + sample: paste ő in UTF-8, or use ő in Hungarian words like hős.
Pitfalls & Tips
Common mistakes when working with lowercase o with double acute.
Name
Prefer ő
The named entity is clearer than inventing names — use ő for U+0151 in HTML.
Case
ő ≠ Ő
Named entities are case-sensitive. Lowercase is ő; uppercase is Ő.
ö
Not ö
German/Swedish ö uses a diaeresis. Hungarian ő uses a double acute — do not substitute one for the other.
Look-alikes
Not single acute
ó (ó) is a single acute. Double acute is a different accent and a different Hungarian vowel.
CSS
Pad the CSS escape
Prefer \0151 (four hex digits). A short \151 can swallow the next hex digit if one follows immediately.
CSS vs HTML
Do not mix escapes
\0151 belongs in CSS strings. ő / ő / ő belong in HTML.
Semicolon
End references
Always finish entities with ; — write ő, not &odblac.
Compatibility
Browser Support
Lowercase o with double acute (U+0151) and its entity forms (ő, ő, ő, CSS \\0151) are supported in all mainstream browsers. Visible glyphs depend on Latin Extended-A / Central European font coverage.
✓ Universal support
Lowercase O Double Acute (ő)
Encode with named, hex, decimal, CSS escape, or type the character — 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+0151Full support
Bottom line: Prefer ő in HTML. Use ő / ő when numeric form is required, and \\0151 only inside CSS content.
Remember
Key Takeaways
Unicode: lowercase o with double acute is U+0151 (decimal 337) — glyph ő.
HTML: prefer ő — also ő / ő / type ő.
Prefer ő (named). You can also use ő (hex), ő (decimal), type ő in UTF-8, or the CSS escape \0151 in content.
U+0151 (LATIN SMALL LETTER O WITH DOUBLE ACUTE). Hex 151, decimal 337. It belongs to Latin Extended-A (U+0100–U+017F).
Yes. HTML5 defines ő for ő. The capital form is Ő (Ő, U+0150) — names are case-sensitive.
Use it for Hungarian words (hős, fő, cső). Prefer ö for German/Swedish ö, and ó for Spanish/Portuguese ó.
HTML entities (ő, ő, or ő) go in markup. The CSS escape \0151 goes in stylesheet strings (usually content on ::before/::after).
No. ő (U+0151) has a double acute accent. ö (U+00F6, ö) has a diaeresis (two dots). ó (U+00F3, ó) has a single acute.
🤔
Did you know?
Lowercase o with double acute is Unicode U+0151 (decimal 337) — LATIN SMALL LETTER O WITH DOUBLE ACUTE in Latin Extended-A. HTML5 provides ő — the most readable form. Capital is Ő (Ő, U+0150). It is a distinct Hungarian letter, not the same as German ö.
