HTML Entity for Uppercase O Macron (Ō)

Beginner

5 min read

Updated: Sep 2026

1 example

Unicode U+014C

HTML Entity for uppercase O macron (U+014C) tutorial illustration

Definition

What Is Uppercase O Macron?

Uppercase O macron (Ō) is the Unicode character at U+014C in Latin Extended-A. Official name: LATIN CAPITAL LETTER O WITH MACRON — a capital O with a horizontal bar above, often marking a long vowel (as in Māori or Hawaiian).

Remember

Character     Ō
Unicode       U+014C
Named entity  &Omacr;  (capital O)
Hex entity    &#x14C;
Decimal       &#332;
CSS escape    \014C
Not the same  ō · Ô · Ö

Prefer &Omacr; in HTML markup — the capital O in the name matters. Numeric forms and typing Ō in UTF-8 also work. For the lowercase letter, use &omacr; (ō).

Reference

Quick Reference

One table for every form you will actually use.

Form	Code	Where it goes
Named entity	`&Omacr;`	HTML markup (preferred)
Direct character	`Ō`	HTML text (UTF-8)
Hex entity	`Ō`	HTML markup
Decimal entity	`Ō`	HTML markup
CSS escape	`\014C`	Stylesheet `content`
Lowercase (related)	ō (U+014D)	Named `&omacr;`

When to Use Which

Situation	Use
Capital O with macron (Ō)	`&Omacr;` or type `Ō`
Lowercase o with macron (ō)	ō (`&omacr;`)
Capital O with circumflex (Ô)	Ô (`Ô`)
Capital O with diaeresis (Ö)	Ö (`Ö`)
Capital O with middle tilde (Ɵ)	Ɵ
Generated text via `::before` / `::after`	`content: "\014C"`

See it

Live Preview

Uppercase O macron rendered alone and next to related letters.

Large glyph Ō

Notation KŌRERO

Compared Ō | ō | Ô

Hint Compare: Macron Ō | Lower ō | Circumflex Ô | Diaeresis Ö

With entities Named: Ō | Hex: Ō | Decimal: Ō

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 Ō, plus a short Māori word example.

html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Uppercase O Macron (Ō)</title>
  <style>
    #point::after {
      content: "\014C";
    }
  </style>
</head>
<body>
  <p>Using Named Entity: &Omacr;</p>
  <p>Using Hex Code: &#x14C;</p>
  <p>Using HTML Code: &#332;</p>
  <p id="point">Using CSS Entity: </p>
  <p>Typed directly: Ō</p>
  <p lang="mi">Word: K&Omacr;RERO</p>
</body>
</html>

Try It Yourself

How It Works

1. Named: &Omacr; (capital O) is the clearest HTML form for U+014C. Lowercase &omacr; is a different character (ō).

2. Hex: U+014C → Ō in HTML. Same glyph as the named entity.

3. Decimal: same code point as 332 → Ō. Same glyph as hex and named.

4. CSS: use \014C in content (not an HTML entity). #point::after appends that Ō after the paragraph text.

5. Typed / word: paste Ō in UTF-8, or build Māori words like K&Omacr;RERO with lang="mi".

Pitfalls & Tips

Common mistakes when working with U+014C.

Case

&Omacr; ≠ &omacr;

&Omacr; → Ō (capital). &omacr; → ō (lowercase). Entity names are case-sensitive.

vs Ô

Not a circumflex

Ô (Ô) is O with a pointed hat. Macron Ō has a flat bar — different letters.

vs Ö

Not a diaeresis

Ö (Ö) is Ö. Do not swap macron and umlaut/diaeresis.

vs Ɵ

Not a middle tilde

Ɵ is O with a tilde through the middle. Macron sits above the letter.

Encoding

Keep UTF-8 declared

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

CSS vs HTML

Do not mix escapes

\014C belongs in CSS strings. &Omacr; / Ō / Ō belong in HTML.

A11y

Use real language context

When Ō appears in Māori or Hawaiian words, keep surrounding text and lang accurate (for example lang="mi").

Compatibility

Browser Support

Uppercase O macron (U+014C) and its entity forms (&Omacr;, Ō, Ō, CSS \\014C) are supported in all mainstream browsers. Latin Extended-A glyphs are widely available in system fonts.

✓ Universal support

Uppercase O Macron (Ō)

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 All versions

Yes

U+014C / &Omacr; Full support

Bottom line: Prefer &Omacr; (capital O) in HTML. Use \\014C only inside CSS content. Do not confuse with &omacr; (ō), circumflex Ô, or diaeresis Ö.

Remember

Key Takeaways

Unicode: uppercase O macron is U+014C (decimal 332) — glyph Ō.
HTML: prefer &Omacr; (capital O) — also Ō / Ō.
CSS: use \014C inside content for generated text.
Meaning: Ō is capital macron — not ō (&omacr;), not Ô (circumflex), not Ö (diaeresis).

One line: U+014C → &Omacr; / Ō / Ō / CSS \014C.

Frequently Asked Questions

How do I display Ō in HTML?

Use &Omacr; (named), Ō (hex), Ō (decimal), type Ō directly in UTF-8, or the CSS escape \014C in content. Prefer &Omacr; in normal HTML.

What is the Unicode value for uppercase O macron?

U+014C (LATIN CAPITAL LETTER O WITH MACRON). Hex 14C, decimal 332. It belongs to Latin Extended-A (U+0100–U+017F).

Is there a named HTML entity for U+014C?

Yes. Use &Omacr; (capital O). Numeric forms Ō and Ō also work. Note: &omacr; (lowercase) is a different letter (ō).

Is Ō the same as ō or Ô?

No. Ō is U+014C (&Omacr;, capital macron). ō is U+014D (&omacr;). Ô is U+00D4 (Ô, circumflex).

When should I use &Omacr;?

Use it for Māori, Hawaiian, Latin, and other orthographies that need long Ō — not as a substitute for Ô or Ö.

What is the difference between HTML code and CSS entity for U+014C?

HTML entities (&Omacr;, Ō, or Ō) go in markup. The CSS escape \014C goes in stylesheet strings (usually content on ::before/::after).

Did you know?

Uppercase O macron is Unicode U+014C (decimal 332) — glyph Ō in Latin Extended-A (U+0100–U+017F). HTML5 names it &Omacr; (capital O). Official name: LATIN CAPITAL LETTER O WITH MACRON. Lowercase is &omacr; (ō, U+014D). Common in Māori, Hawaiian, Latin, and linguistic length marking. Do not confuse with circumflex Ô (Ô) or middle-tilde Ɵ (U+019F).

Next: Uppercase O Middle Tilde

Learn the HTML entity for uppercase O with middle tilde (U+019F).

Continue tutorial →

About the author

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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