HTML Entity for Uppercase O (O)
What You'll Learn
How to display the uppercase letter O in HTML using entity methods. The letter O is the fifteenth letter of the Latin alphabet (U+004F) and is part of the Basic Latin block. In most cases you can type it directly; numeric or CSS entities are useful when escaping, generating content via CSS, or ensuring correct encoding.
This character can be displayed using the character itself, a hexadecimal reference, a decimal reference, or a CSS escape in the content property. There is no named HTML entity like &O; for this letter.
⚡ Quick Reference — Uppercase O Entity
U+004FBasic Latin (ASCII)
OHexadecimal reference
ODecimal reference
OType directly (no named entity)
Name Value
──────────── ──────────
Unicode U+004F
Hex code O
HTML code O
Named entity (none — use O directly)
CSS code \4F
Meaning Latin capital letter O
Related U+006F = o (lowercase)
Block Basic Latin (U+0000–U+007F)Complete HTML Example
A simple example showing the uppercase letter O using hexadecimal code, decimal HTML code, the character directly, and a CSS content escape:
<!DOCTYPE html>
<html>
<head>
<style>
#point:after{
content: "\4F";
}
</style>
</head>
<body>
<p>Symbol (hex): O</p>
<p>Symbol (decimal): O</p>
<p>Symbol (direct): O</p>
<p id="point">Symbol (CSS): </p>
</body>
</html>🌐 Browser Support
The uppercase letter O (U+004F) is universally supported in all browsers and platforms as part of Basic Latin:
👀 Live Preview
See the uppercase letter O in common text contexts:
🧠 How It Works
Hexadecimal Code
O uses the Unicode hexadecimal value 4F to display the letter. The x prefix indicates hexadecimal format.
Decimal HTML Code
O uses the decimal Unicode value 79 to display the same character. This is the ASCII/Unicode decimal for O.
Direct Character
Type O directly in HTML. There is no named entity like &O;; the character itself is the standard approach in body text.
CSS Entity
\4F 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: O. Unicode U+004F sits in Basic Latin. The lowercase form is U+006F (o). In normal text, typing O is preferred.
Use Cases
The uppercase letter O (or its entity forms) is commonly used in:
Standard character in paragraphs, articles, and any Latin-script text. Usually typed directly.
Use in ARIA labels, alt text, placeholders, and attribute values; numeric entities help when escaping is needed.
Reference in font specs, CSS content, or generated text via CSS entities.
Teaching the alphabet, phonics, or character encoding; entity codes clarify the exact character.
When building HTML or strings programmatically, numeric entities ensure correct output.
Part of Basic Latin used across languages; entities can help in legacy encoding contexts.
CSS content or list-style may use the character via entity for styling.
💡 Best Practices
Do
- Type
Odirectly in body content; use entities only when necessary - Serve pages as UTF-8 so Basic Latin characters render without entities
- Use numeric references (
OorO) when escaping is required - Use
\4Fin CSScontentwhen generating the letter via pseudo-elements - Remember uppercase O is U+004F and lowercase o is U+006F when case matters
Don’t
- Overuse numeric entities for
Oin normal readable text - Expect a named HTML entity like
&O;—none exists for this letter - Put CSS escape
\4Fin HTML text nodes - Use padded Unicode notation like U+0004F—the correct value is
U+004F - Use
\0004Fin CSS—the correct escape is\4F
Key Takeaways
Type O directly, or use hex/decimal references
O OFor CSS stylesheets, use the escape in the content property
\4FUnicode U+004F — LATIN CAPITAL LETTER O
Fifteenth letter of the Latin alphabet (Basic Latin block)
Previous: Uppercase Nj Small (Nj) Next: Uppercase O Above Dot Macron
❓ Frequently Asked Questions
O directly, or use O (hex), O (decimal), or \4F in CSS content. For most content, typing O is standard; use numeric or CSS entities when escaping or generating via CSS.U+004F (LATIN CAPITAL LETTER O). Basic Latin block. Hex 4F, decimal 79. It is the fifteenth letter of the Latin alphabet.::before/::after, ensuring encoding in legacy systems, or building strings programmatically. In normal body text, typing O is preferred.O or O) is used in HTML content or attributes. The CSS entity (\4F) is used in CSS, e.g. in the content property of pseudo-elements. Both produce O but in different contexts.O directly. HTML entities are more useful for CSS content properties, programmatic generation, or when explicit encoding is required. Understanding entity codes for basic letters helps with education and tooling.Explore More HTML Entities!
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