HTML Entity for Uppercase U Horn (Ư)

Beginner
⏱️ 5 min read
📚 Updated: Jun 2026
🎯 1 Code Example
Unicode U+01AF
HTML Entity for Uppercase U Horn tutorial illustration

What You'll Learn

How to display the uppercase U with horn (Ư) in HTML using hexadecimal, decimal, and CSS escape methods. This character is U+01AF in the Latin Extended-B block. It combines the letter U with a horn diacritic and is the capital form of a distinct letter in the Vietnamese alphabet (e.g. TƯƠNG, THƯ, ƯỚC).

Render it with Ư, Ư, or CSS escape \01AF. There is no named HTML entity for this character. In UTF-8 documents you can also type Ư directly.

⚡ Quick Reference — Uppercase U Horn Entity

Unicode U+01AF

Latin Extended-B

Hex Code Ư

Hexadecimal reference

HTML Code Ư

Decimal reference

Named Entity —

No named entity

Reference Table
Name           Value
────────────   ──────────
Unicode        U+01AF
Hex code       Ư
HTML code      Ư
Named entity   (none)
CSS code       \01AF
Meaning        Latin capital letter U with horn
Related        U+01B0 = ư (lowercase)
Block          Latin Extended-B (U+0180–U+024F)
1

Complete HTML Example

A simple example showing the uppercase U horn (Ư) using hexadecimal code, decimal HTML code, the character directly, and a CSS content escape:

html
<!DOCTYPE html>
<html>
<head>
 <style>
  #point:after{
   content: "\01AF";
  }
 </style>
</head>
<body>
<p>Symbol (hex): &#x01AF;</p>
<p>Symbol (decimal): &#431;</p>
<p>Symbol (direct): Ư</p>
<p id="point">Symbol (CSS): </p>
</body>
</html>
Try It Yourself

🌐 Browser Support

The uppercase U horn (Ư) is supported in all modern browsers as part of Latin Extended-B:

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

👀 Live Preview

See the uppercase U horn (Ư) in language and content contexts:

Large glyphƯ
VietnameseTƯƠNG, THƯ, ƯỚC, TƯởNG
Case pairƯ (uppercase) / ư (lowercase)
Unicode nameLatin capital letter U with horn
Not the same asplain U (U+0055)  |  Ʊ (o with horn)  |  Ü (&Uuml;)
Numeric refs&#x01AF; &#431; \01AF

🧠 How It Works

1

Hexadecimal Code

&#x01AF; uses the Unicode hexadecimal value 01AF to display the character. The x prefix indicates hexadecimal format.

HTML markup
2

Decimal HTML Code

&#431; uses the decimal Unicode value 431 to display the same character. A common method when a numeric reference is needed.

HTML markup
3

Direct Character

Type Ư directly in HTML when your document uses UTF-8 encoding. There is no named entity for this precomposed letter.

HTML markup
4

CSS Entity

\01AF is used in CSS stylesheets, particularly in the content property of pseudo-elements like ::before and ::after.

CSS stylesheet
=

Same visual result

All methods produce the glyph: Ư. Unicode U+01AF sits in Latin Extended-B. Lowercase equivalent: U+01B0 (ư). Do not confuse with plain U or Ʊ (o with horn).

✅

Use Cases

The uppercase U horn (Ư) is commonly used in:

🇻🇳 Vietnamese

Capital form of the horned u in Vietnamese orthography (TƯƠNG, THƯ, ƯỚC) for headlines, signage, and localized UI.

🌐 Internationalization

Multilingual websites, CMS content, and email templates requiring correct Vietnamese characters.

📚 Language Learning

Vietnamese courses, dictionaries, and grammar resources teaching the horn diacritic on U.

📝 Linguistics & Phonology

Phonetic transcription and linguistic descriptions using U with horn marking.

📄 Forms & UI

Input validation messages, labels, and placeholders in Vietnamese-language applications.

♿ Accessibility

Using the correct character (U+01AF) with lang="vi" helps assistive technologies interpret Vietnamese text correctly.

⚙ Programmatic HTML

When building HTML from Vietnamese data, using &#431; or &#x01AF; guarantees correct output.

💡 Best Practices

Do

  • Serve pages as UTF-8; you can type Ư directly in UTF-8 source
  • Use numeric references (&#x01AF; or &#431;) when escaping is required
  • Use \01AF in CSS content when generating the symbol via pseudo-elements
  • Use fonts that support Latin Extended-B characters (U+0180–U+024F)
  • Set lang="vi" on Vietnamese content for accessibility and SEO

Don’t

  • Confuse Ư with plain U or Ʊ (o with horn) when the horned letter is required
  • Expect a named HTML entity—none exists for Ư
  • Use the old incorrect CSS escape \001AF—the correct value is \01AF
  • Put CSS escape \01AF in HTML text nodes
  • Double-encode numeric references in dynamically generated HTML

Key Takeaways

1

Type Ư directly, or use hex/decimal references

&#x01AF; &#431;
2

For CSS stylesheets, use the escape in the content property

\01AF
3

Unicode U+01AF — LATIN CAPITAL LETTER U WITH HORN

4

Vietnamese letter (uppercase); lowercase is ư (U+01B0)

5

Previous: Uppercase U Grave (Ù)   Next: Uppercase U Inverted Breve

❓ Frequently Asked Questions

Use &#x01AF; (hex), &#431; (decimal), or \01AF in CSS content. There is no named HTML entity for Ư. In UTF-8 you can also type Ư directly.
U+01AF (LATIN CAPITAL LETTER U WITH HORN). Latin Extended-B block. Hex 01AF, decimal 431. Essential in Vietnamese. Lowercase form is U+01B0 (ư).
When displaying Vietnamese text in uppercase, multilingual websites, localized UI, language learning materials, or any content requiring the capital U with horn diacritic.
No. There is no named HTML entity for Ư. Use numeric codes &#431; or &#x01AF;, or the CSS entity \01AF. Do not confuse with plain U (U+0055) or Ʊ (o with horn).
HTML code (&#431; or &#x01AF;) is used in HTML content; CSS entity \01AF is used in stylesheets in the content property of pseudo-elements. Both produce Ư.

Explore More HTML Entities!

Discover 1500+ HTML character references — letters, symbols, and more.

All HTML Entities →

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
  • Focus Full Stack Development, AWS, and Developer Education

I write practical tutorials so students and working developers can learn by doing—from databases and APIs to deployment on AWS.

AWS Certified Developer – Associate (Credly)

8 people found this page helpful

Uppercase U Grave (Ù) Uppercase U Inverted Breve