Planck Constant Over Two Pi Letter
ℏ denotes Planck’s constant over two pi and is widely used in physics and equations.
U+210F
The symbol ℏ is the Unicode character “PLANCK CONSTANT OVER TWO PI” (U+210F). It’s commonly used in scientific writing to represent reduced Planck’s constant. Use it anywhere you need a precise, typable physics symbol.
Planck Constant Over Two Pi Letter Meaning
ℏ (U+210F) is read as “h-bar” and represents the reduced Planck constant, often written as ℏ (h divided by 2π). In physics, it appears throughout quantum mechanics and related fields, where it helps express relationships involving quantum effects, angular momentum, and wave behavior. Because it’s a distinct Unicode symbol, it’s better to use ℏ directly instead of approximations made from plain letters (like h with a bar). This page includes practical copy options and developer-friendly escapes for consistent use across platforms.
Common uses
- •Writing quantum mechanics and physics equations in documents
- •Labeling variables in STEM teaching materials and slides
- •Annotating research notes, posters, and lab reports
- •Designing infographics or charts that include physics notation
- •Using the symbol in code comments, formulas, and technical UI text
Examples
ℏ Planck constant over two pi
- ℏThe energy relation uses ℏω.
- ℏAngular momentum is quantized in units of ℏ.
- ℏFor small systems, ℏ controls the scale of quantum effects.
- ℏWe define ℏ = h / (2π) in the derivation.
- ℏThe Schrödinger equation can be written with ℏ.
Variations
Technical codes
| Unicode | U+210F | |
| HTML Entity | ℏ | |
| HTML Code | ℏ | |
| CSS | \210F | |
| Alt Code | Alt + 8463 | |
| Decimal | 8463 |
How to type Planck Constant Over Two Pi Letter (ℏ)
On Windows
Hold Alt and type 8463 on the numeric keypad. In Word, type 210F then press Alt + X.
On Mac
Switch to the Unicode Hex Input keyboard, then hold Option and type 210F. Or press Control + Command + Space and search.
On Linux
Press Control + Shift + U, type 210f, then press Enter or Space.
Anywhere
Copy ℏ with the button above and paste it wherever you need it — this works on every device and in every app, with no keyboard shortcut to remember.
FAQ
What does the Planck Constant Over Two Pi letter mean?
ℏ (U+210F) is read as “h-bar” and represents the reduced Planck constant, often written as ℏ (h divided by 2π). In physics, it appears throughout quantum mechanics and related fields, where it helps express relationships involving quantum effects, angular momentum, and wave behavior. Because it’s a distinct Unicode symbol, it’s better to use ℏ directly instead of approximations made from plain letters (like h with a bar). This page includes practical copy options and developer-friendly escapes for consistent use across platforms.
What is the Unicode code point for ℏ?
ℏ is Unicode U+210F (html entity: ℏ).
How do I type ℏ on the web using escapes?
You can use CSS escape \\210F or JavaScript escape \\u{210F}.
Is ℏ the same as the regular letter h?
No. ℏ is a specific Unicode symbol for the reduced Planck constant; it is not just the letter h with formatting.
Where is ℏ most commonly used?
It’s most often used in physics and technical writing to represent reduced Planck’s constant in formulas.