HTML Entity for Uppercase O Horn (Ơ)

Beginner

5 min read

Updated: Sep 2026

1 example

Unicode U+01A0

HTML Entity for uppercase O horn (U+01A0) tutorial illustration

Definition

What Is Uppercase O Horn?

Uppercase O horn (Ơ) is the Unicode character at U+01A0 in Latin Extended-B. Official name: LATIN CAPITAL LETTER O WITH HORN — a capital O with a horn (móc) on the right, used especially in Vietnamese.

Remember

Character     Ơ
Unicode       U+01A0
Named entity  &Ohorn;  (capital O)
Hex entity    &#x1A0;
Decimal       &#416;
CSS escape    \01A0
Not the same  ơ · Ô · O

Prefer &Ohorn; in HTML markup — the capital O in the name matters. Numeric forms and typing Ơ in UTF-8 also work. For the lowercase letter, use &ohorn; (ơ).

Reference

Quick Reference

One table for every form you will actually use.

Form	Code	Where it goes
Named entity	`&Ohorn;`	HTML markup (preferred)
Direct character	`Ơ`	HTML text (UTF-8)
Hex entity	`Ơ`	HTML markup
Decimal entity	`Ơ`	HTML markup
CSS escape	`\01A0`	Stylesheet `content`
Lowercase (related)	ơ (U+01A1)	Named `&ohorn;`

When to Use Which

Situation	Use
Capital O with horn (Ơ)	`&Ohorn;` or type `Ơ`
Lowercase o with horn (ơ)	ơ (`&ohorn;`)
Capital O with circumflex (Ô)	Ô (`Ô`)
Capital O with grave (Ò)	Ò (`Ò`)
Plain capital O	O (U+004F)
Generated text via `::before` / `::after`	`content: "\01A0"`

See it

Live Preview

Uppercase O horn rendered alone and next to related letters.

Large glyph Ơ

Notation ƠN

Compared Ơ | ơ | Ô

Hint Compare: Horn Ơ | Lower ơ | Circumflex Ô | Plain O

With entities Named: &Ohorn; | Hex: Ơ | Decimal: Ơ

Code

Complete HTML Example

One page that shows the letter with named, hex, decimal, CSS escape, and a typed character. Use View Output or open the live editor.

Named + Hex + Decimal + CSS + Typed

Five ways to produce Ơ, plus a short Vietnamese example.

html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Uppercase O Horn (Ơ)</title>
  <style>
    #point::after {
      content: "\01A0";
    }
  </style>
</head>
<body>
  <p>Using Named Entity: &Ohorn;</p>
  <p>Using Hex Code: &#x1A0;</p>
  <p>Using HTML Code: &#416;</p>
  <p id="point">Using CSS Entity: </p>
  <p>Typed directly: Ơ</p>
  <p lang="vi">Word: &Ohorn;N</p>
</body>
</html>

Try It Yourself

How It Works

1. Named: &Ohorn; (capital O) is the clearest HTML form for U+01A0. Lowercase &ohorn; is a different character (ơ).

2. Hex: U+01A0 → Ơ in HTML. Same glyph as the named entity.

3. Decimal: same code point as 416 → Ơ. Same glyph as hex and named.

4. CSS: use \01A0 in content (not an HTML entity). #point::after appends that Ơ after the paragraph text.

5. Typed / word: paste Ơ in UTF-8, or build Vietnamese text like &Ohorn;N with lang="vi".

Pitfalls & Tips

Common mistakes when working with U+01A0.

Case

&Ohorn; ≠ &ohorn;

&Ohorn; → Ơ (capital). &ohorn; → ơ (lowercase). Entity names are case-sensitive.

vs Ô

Not a circumflex

Ô (Ô) is O with circumflex. Horn Ơ and circumflex Ô are different Vietnamese vowels.

vs O

Not plain capital O

Keyboard O is U+004F. Use U+01A0 only when you need the horned letter.

Tones

Extra tones are other code points

Vietnamese Ớ, Ờ, Ở, Ỡ, Ợ combine horn with tone marks as separate precomposed characters — not plain Ơ alone.

Encoding

Keep UTF-8 declared

Latin Extended-B letters display reliably with <meta charset="UTF-8">. Prefer named entities when encoding is uncertain.

CSS vs HTML

Do not mix escapes

\01A0 belongs in CSS strings. &Ohorn; / Ơ / Ơ belong in HTML.

A11y

Use real language context

When Ơ appears in Vietnamese words, keep surrounding text and lang="vi" accurate so screen readers get useful context.

Compatibility

Browser Support

Uppercase O horn (U+01A0) and its entity forms (&Ohorn;, Ơ, Ơ, CSS \\01A0) are supported in all mainstream browsers. Latin Extended-B glyphs are widely available in system fonts that cover Vietnamese.

✓ Universal support

Uppercase O Horn (Ơ)

Encode with named, hex, decimal, CSS escape, or type the character — same code point everywhere encoding is supported.

100% Browser coverage

Google Chrome Supported

Yes

Microsoft Edge Supported

Yes

Mozilla Firefox Supported

Yes

Apple Safari Supported

Yes

Opera Supported

Yes

Internet Explorer IE 9+

Yes

U+01A0 / &Ohorn; Full support

Bottom line: Prefer &Ohorn; (capital O) in HTML. Use \\01A0 only inside CSS content. Do not confuse with &ohorn; (ơ), circumflex Ô, or plain O.

Remember

Key Takeaways

Unicode: uppercase O horn is U+01A0 (decimal 416) — glyph Ơ.
HTML: prefer &Ohorn; (capital O) — also Ơ / Ơ.
CSS: use \01A0 inside content for generated text.
Meaning: Ơ is capital horn — not ơ (&ohorn;), not Ô (circumflex), not plain O.

One line: U+01A0 → &Ohorn; / Ơ / Ơ / CSS \01A0.

Frequently Asked Questions

How do I display Ơ in HTML?

Use &Ohorn; (named), Ơ (hex), Ơ (decimal), type Ơ directly in UTF-8, or the CSS escape \01A0 in content. Prefer &Ohorn; in normal HTML.

What is the Unicode value for uppercase O horn?

U+01A0 (LATIN CAPITAL LETTER O WITH HORN). Hex 1A0, decimal 416. It belongs to Latin Extended-B (U+0180–U+024F).

Is there a named HTML entity for U+01A0?

Yes. Use &Ohorn; (capital O). Numeric forms Ơ and Ơ also work. Note: &ohorn; (lowercase) is a different letter (ơ).

Is Ơ the same as ơ or Ô?

No. Ơ is U+01A0 (&Ohorn;, capital horn). ơ is U+01A1 (&ohorn;). Ô is U+00D4 (Ô, circumflex).

When should I use &Ohorn;?

Use it for Vietnamese and other orthographies that need Ơ — not as a substitute for Ô or plain O.

What is the difference between HTML code and CSS entity for U+01A0?

HTML entities (&Ohorn;, Ơ, or Ơ) go in markup. The CSS escape \01A0 goes in stylesheet strings (usually content on ::before/::after).

Did you know?

Uppercase O horn is Unicode U+01A0 (decimal 416) — glyph Ơ in Latin Extended-B (U+0180–U+024F). HTML5 names it &Ohorn; (capital O). Official name: LATIN CAPITAL LETTER O WITH HORN. Lowercase is &ohorn; (ơ, U+01A1). Essential in Vietnamese orthography. Do not confuse with circumflex Ô (Ô) or plain O.

Next: Uppercase O Inverted Breve

Learn the HTML entity for uppercase O with inverted breve (U+020E).

Continue tutorial →

About the author

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.

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