HTML Entity for Uppercase O Horn (Ơ)
What You'll Learn
How to display the uppercase O with horn (Ơ) in HTML using hexadecimal, decimal, and CSS escape methods. This character is U+01A0 in the Latin Extended-B block. The horn diacritic is essential in Vietnamese, where Ơ is the capital form of one of the twelve vowel letters and represents a distinct mid-central vowel sound.
Render it with Ơ, Ơ, or CSS escape \01A0. There is no named HTML entity for this character. In UTF-8 documents you can also type Ơ directly. Do not confuse Ơ with Ô (circumflex) or plain O—each is a distinct vowel in Vietnamese.
⚡ Quick Reference — Uppercase O Horn Entity
U+01A0Latin Extended-B
ƠHexadecimal reference
ƠDecimal reference
—No named entity
Name Value
──────────── ──────────
Unicode U+01A0
Hex code Ơ
HTML code Ơ
Named entity (none)
CSS code \01A0
Meaning Latin capital letter O with horn
Related U+01A1 = ơ (lowercase)
Block Latin Extended-B (U+0180–U+024F)Complete HTML Example
A simple example showing the uppercase O horn (Ơ) using hexadecimal code, decimal HTML code, the character directly, and a CSS content escape:
<!DOCTYPE html>
<html>
<head>
<style>
#point:after{
content: "\01A0";
}
</style>
</head>
<body>
<p>Symbol (hex): Ơ</p>
<p>Symbol (decimal): Ơ</p>
<p>Symbol (direct): Ơ</p>
<p id="point">Symbol (CSS): </p>
</body>
</html>🌐 Browser Support
The uppercase O horn (Ơ) is supported in all modern browsers as part of Latin Extended-B:
👀 Live Preview
See the uppercase O horn (Ơ) in Vietnamese contexts:
🧠 How It Works
Hexadecimal Code
Ơ uses the Unicode hexadecimal value 01A0 to display the character. The x prefix indicates hexadecimal format.
Decimal HTML Code
Ơ uses the decimal Unicode value 416 to display the same character. A common method when a numeric reference is needed.
Direct Character
Type Ơ directly in HTML when your document uses UTF-8 encoding. There is no named entity for this Vietnamese vowel.
CSS Entity
\01A0 is used in CSS stylesheets, particularly in the content property of pseudo-elements like ::before and ::after.
Same visual result
All methods produce the glyph: Ơ. Unicode U+01A0 sits in Latin Extended-B. Lowercase equivalent: U+01A1 (ơ). In Vietnamese, Ơ can combine with tone marks (e.g. Ớ, Ờ, ờ, Ở, Ợ). Do not confuse with Ô (circumflex).
Use Cases
The uppercase O horn (Ơ) is commonly used in:
Essential for capitalized Vietnamese text at sentence start or in titles. Ơ is a distinct vowel, not interchangeable with O or Ô.
Headwords, definitions, and pronunciation guides for Vietnamese words containing Ơ or capitalized forms of ơ.
Lessons, flashcards, and vocabulary content for Vietnamese learners showing the correct Ơ character.
Vietnamese versions of websites, product names, place names, and localized user content.
Articles, news, and formal documents that require correct Vietnamese typography with capital vowels.
Using U+01A0 with lang="vi" ensures assistive technologies interpret Vietnamese text correctly.
When building HTML from translation data, using Ơ or Ơ guarantees correct output.
💡 Best Practices
Do
- Serve pages as UTF-8; you can type Ơ directly in UTF-8 source
- Use numeric references (
ƠorƠ) when escaping is required - Set
lang="vi"on Vietnamese content blocks - Use fonts that support Latin Extended-B (U+0180–U+024F)
- Distinguish Ơ (horn) from Ô (circumflex) and plain O
Don’t
- Substitute plain
OorÔwhen Ơ is required in Vietnamese - Confuse Ơ (horn) with Ô (circumflex)—they are different vowels
- Expect a named HTML entity—none exists for Ơ
- Put CSS escape
\01A0in HTML text nodes - Double-encode numeric references in dynamically generated HTML
Key Takeaways
Type Ơ directly, or use hex/decimal references
Ơ ƠFor CSS stylesheets, use the escape in the content property
\01A0Unicode U+01A0 — LATIN CAPITAL LETTER O WITH HORN
Essential for Vietnamese; lowercase is ơ (U+01A1)
Previous: Uppercase O Grave (Ò) Next: Uppercase O Inverted Breve
❓ Frequently Asked Questions
Ơ (hex), Ơ (decimal), or \01A0 in CSS content. There is no named HTML entity for Ơ. In UTF-8 you can also type Ơ directly.U+01A0 (LATIN CAPITAL LETTER O WITH HORN). Latin Extended-B block. Hex 01A0, decimal 416. Essential for Vietnamese orthography. Lowercase form is U+01A1 (ơ).Ơ or Ơ, or the CSS entity \01A0. In UTF-8 pages you can type Ơ directly.Explore More HTML Entities!
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