Home HTML Entities Planck Constant (ℎ) HTML Entity for Planck Constant (ℎ) Definition
What Is the Planck Constant Entity? Planck Constant is the letterlike symbol at Unicode U+210E for Planck’s constant h (ℎ ). Prefer the named entity ℎ, or use ℎ / ℎ.
Character ℎ
Unicode U+210E
Named entity ℎ
Hex entity ℎ
Decimal ℎ
CSS escape \210E Hex, decimal, named, and CSS all produce the same symbol. Do not confuse it with h-bar ℏ (ℏ) or Latin h.
Reference
Quick Reference One table for every form you will actually use.
Form Code Where it goes Named entity ℎHTML (preferred) Hex entity ℎHTML Decimal entity ℎHTML CSS escape \210EStylesheet content Reduced (h-bar) ℏU+210F — different character
When to Use Which Situation Use Planck’s constant h in HTML ℎNeed a numeric entity ℎ or ℎGenerated text via ::before / ::after content: "\210E"Reduced Planck constant (ℏ) See Planck Constant Over Two Pi — ℏ Ordinary Latin letter h Type h — not U+210E
See it
Live Preview Planck constant in physics context, compared with lookalikes.
Example E = ℎf
Large glyph ℎ
Named entity ℎ → ℎ
vs lookalikes ℎ | ℏ | h
With entities Hex: ℎ | Decimal: ℎ | Named: ℎ
Code
Complete HTML Example One page that shows Planck Constant with hex, decimal, named, and CSS forms. Use View Output or open the live editor.
Hex + Decimal + Named + CSS Four ways to render U+210E (Planck constant ℎ).
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Planck Constant (U+210E)</title>
<style>
#point::after {
content: "\210E";
}
</style>
</head>
<body>
<p>Using Hex Code: ℎ</p>
<p>Using HTML Code: ℎ</p>
<p>Using Named Entity: ℎ</p>
<p>Formula: E = ℎf</p>
<p id="point">Using CSS Entity: </p>
</body>
</html> Using Hex Code: ℎ
Using HTML Code: ℎ
Using Named Entity: ℎ
Formula: E = ℎf
Using CSS Entity: ℎ How It Works 1. Hex: ℎ inserts U+210E from its hex value → ℎ.
2. Decimal: same character as 8462 → ℎ. Same visual result.
3. Named: ℎ is the readable HTML5 name for Planck’s constant.
4. CSS: use \210E only inside content (e.g. on ::after).
Pitfalls & Tips Common mistakes when working with Planck Constant.
vs ℏ Not ℏ ℏ is U+210F (h-bar / reduced). Planck’s constant h is U+210E with ℎ.
vs h Not Latin letter h Ordinary h (U+0068) is fine in prose, but U+210E is the dedicated letterlike physics symbol.
Name Remember the trailing h ℎ (with h) is U+210E. ℏ (no trailing h) is U+210F.
A11y Spell out on first use In teaching content, write “Planck’s constant h ” once before relying on ℎ alone.
CSS vs HTML Do not mix escapes \210E belongs in CSS. ℎ / ℎ belong in HTML.
Semicolon End references Always finish with ; — write ℎ, not &planckh.
Compatibility
Browser Support Planck Constant (U+210E) and its entity forms (ℎ, ℎ, ℎ, CSS \\210E) are supported in all mainstream browsers.
✓ Universal support
Planck Constant (ℎ) Encode with named, hex, decimal, or CSS escape. Letterlike physics symbol — not h-bar.
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+210E Full support
Bottom line: Prefer ℎ in HTML. Use \\210E only inside CSS content.
Remember
Key Takeaways Unicode: Planck Constant is U+210E (decimal 8462).
HTML: prefer ℎ (also ℎ / ℎ).
CSS: use \210E inside content.
Lookalike: not ℏ (ℏ) or Latin h.
One line: U+210E → ℎ (also ℎ / ℎ / CSS \210E).
Frequently Asked Questions How do I display Planck Constant in HTML using entities? Use ℎ (hex), ℎ (decimal), ℎ (named), or the CSS escape \210E in the content property. All four render the Planck constant symbol ℎ.
What is the Unicode value for Planck Constant? U+210E (PLANCK CONSTANT). Hex 210E, decimal 8462. It belongs to the Letterlike Symbols block.
Is there a named HTML entity for U+210E? Yes. Prefer ℎ for readable HTML. It is the standard named entity for Planck’s constant h.
When should I use this HTML entity? Use it in physics and quantum-mechanics text when you need the dedicated Planck constant glyph — for example E = ℎf written as E = ℎf.
Is U+210E the same as h-bar (ℏ)? No. U+210E (ℎ) is PLANCK CONSTANT (ℎ). U+210F (ℏ) is PLANCK CONSTANT OVER TWO PI — the reduced constant ℏ (h-bar).
What is the difference between HTML code and CSS entity for ℎ? HTML entities (ℎ, ℎ, or ℎ) go in markup. The CSS escape \210E is used in stylesheets (usually in content on ::before/::after). Both render ℎ.
🤔
Did you know? Planck Constant is Unicode U+210E (decimal 8462 ) — in Letterlike Symbols. Prefer the named entity ℎ, or use ℎ / ℎ. Do not confuse with reduced Planck constant ℏ (ℏ, U+210F) or ordinary Latin h.
Next: Planck Constant Over Two Pi Continue with the reduced Planck constant (ℏ, ℏ) entity tutorial.
h-bar tutorial → About the author Developer, cloud engineer, and technical writer
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