HTML Entity for Lowercase O Double Acute (ő)

Beginner
⏱️ 5 min read
📚 Updated: Jun 2026
🎯 1 Code Example
Unicode U+0151
HTML Entity for Lowercase O Double Acute tutorial illustration

What You'll Learn

How to display the lowercase o with double acute (ő) in HTML using named entity, hexadecimal, decimal, and CSS escape methods. This character is U+0151 in the Latin Extended-A block. The double acute (˝) diacritic is used in Hungarian; ő represents a long front rounded vowel, distinct from ö (diaeresis) and ó (acute).

Render it with ő, ő, ő, or CSS escape \0151. The named entity ő is the standard HTML character reference for Hungarian ő.

⚡ Quick Reference — Lowercase O Double Acute Entity

Unicode U+0151

Latin Extended-A

Hex Code ő

Hexadecimal reference

HTML Code ő

Decimal reference

Named Entity ő

Most readable option

Reference Table
Name           Value
────────────   ──────────
Unicode        U+0151
Hex code       ő
HTML code      ő
Named entity   ő
CSS code       \0151
Meaning        Latin small letter o with double acute
Related        U+0150 = Ő (Ő)
Block          Latin Extended-A (U+0100–U+017F)
1

Complete HTML Example

A simple example showing the lowercase o double acute (ő) using hexadecimal code, decimal HTML code, the named entity, and a CSS content escape:

html
<!DOCTYPE html>
<html>
<head>
 <style>
  #point:after{
   content: "\0151";
  }
 </style>
</head>
<body>
<p>Symbol (hex): &#x0151;</p>
<p>Symbol (decimal): &#337;</p>
<p>Symbol (named): &odblac;</p>
<p id="point">Symbol (CSS): </p>
</body>
</html>
Try It Yourself

🌐 Browser Support

The lowercase o double acute (ő) and the named entity &odblac; are supported in all modern browsers:

Chrome1+
Firefox1+
Safari1+
Edge12+
Opera4+
Android4.4+
iOS Safari1+

👀 Live Preview

See the lowercase o double acute (ő) in Hungarian contexts:

Large glyphő
Hungarianhős  |  fő  |  cső  |  szőr
Named entity&odblac; renders as ő
UppercaseŐ (U+0150) — use &Odblac;
Not the same asö (diaeresis)  |  ó (acute)  |  o (plain)
Numeric refs&#x0151; &#337; &odblac; \0151

🧠 How It Works

1

Hexadecimal Code

&#x0151; uses the Unicode hexadecimal value 0151 to display the character. The x prefix indicates hexadecimal format.

HTML markup
2

Decimal HTML Code

&#337; uses the decimal Unicode value 337 to display the same character. A common method when a numeric reference is needed.

HTML markup
3

Named Entity

&odblac; is the named entity for o double acute—readable in source HTML and essential for correct Hungarian spelling.

HTML markup
4

CSS Entity

\0151 is used in CSS stylesheets, particularly in the content property of pseudo-elements like ::before and ::after.

CSS stylesheet
=

Same visual result

All four methods produce the glyph: ő. Unicode U+0151 sits in Latin Extended-A. Uppercase equivalent: U+0150 (Ő, &Odblac;). Do not confuse with ö (diaeresis) or ó (acute) in Hungarian.

✅

Use Cases

The lowercase o double acute (ő) is commonly used in:

🇭🇺 Hungarian

Essential for correct spelling (hős, fő, cső, szőr). The double acute is distinct from ö and ó in meaning and pronunciation.

📚 Dictionaries

Headwords, definitions, and pronunciation guides for Hungarian words containing ő.

🌐 Language Learning

Hungarian lessons, flashcards, and vocabulary content with correct ő spelling.

⚙ Multilingual Sites

Hungarian localized websites, product names, place names, and user-generated content.

📝 Publishing

Articles, books, and formal documents requiring correct Hungarian typography.

♿ Accessibility

Using the correct character (U+0151) with lang="hu" ensures assistive technologies pronounce Hungarian correctly.

🎨 CSS Generated Content

Using \0151 in the CSS content property to insert ő via pseudo-elements.

💡 Best Practices

Do

  • Serve pages as UTF-8; you can type ő directly in UTF-8 source
  • Use &odblac; for readable HTML when a named form is preferred
  • Set lang="hu" on Hungarian content for correct pronunciation
  • Use \0151 in CSS content when generating the symbol via pseudo-elements
  • Distinguish ő (double acute) from ö (diaeresis) and ó (acute)

Don’t

  • Substitute ö or ó when ő is required in Hungarian text
  • Confuse ő (double acute), ö (diaeresis), and ó (acute)
  • Put CSS escape \0151 in HTML text nodes
  • Double-encode entity references in dynamically generated HTML
  • Omit lang="hu" attributes on Hungarian pages

Key Takeaways

1

The named entity is the standard form for Hungarian

&odblac;
2

Numeric alternatives: hex and decimal

&#x0151; &#337;
3

Unicode U+0151 — LATIN SMALL LETTER O WITH DOUBLE ACUTE

4

Essential for Hungarian; uppercase is Ő (&Odblac;)

5

Previous: Lowercase O Dot Above (ȯ)   Next: Lowercase O Double Grave

❓ Frequently Asked Questions

Use &odblac; (named), &#x0151; (hex), &#337; (decimal), or \0151 in CSS content. In UTF-8 you can also type ő directly.
U+0151 (LATIN SMALL LETTER O WITH DOUBLE ACUTE). Latin Extended-A block. Hex 0151, decimal 337. Used in Hungarian. Uppercase form is U+0150 (Ő).
When displaying Hungarian text where ő is required. Substituting ö or ó can change word meaning. Use in Hungarian content, dictionaries, language learning, and multilingual sites.
The named HTML entity is &odblac;. You can also use &#337; or &#x0151;, or the CSS entity \0151.
ő (U+0151) is o with double acute (long front rounded vowel); ö (U+00F6) is o with diaeresis (short front rounded vowel); ó (U+00F3) is o with acute (long back rounded vowel). They are distinct letters with different sounds and meanings.

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About the author

Mari Selvan M P
Mari Selvan M P 🔗

Developer, cloud engineer, and technical writer

  • Experience 12 years building web and cloud systems
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I write practical tutorials so students and working developers can learn by doing—from databases and APIs to deployment on AWS.

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