π is the Unicode character TETRAGRAM FOR YOUTHFULNESS, code point U+1D311 (decimal 119569) in the Tai Xuan Jing Symbols block, added in Unicode 4.0. In HTML write 𝌑, and in UTF-8 it is the 4 bytes F0 9D 8C 91.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D311 |
| Decimal | 119569 |
| UTF-8 bytes | F0 9D 8C 91 |
| UTF-16 (big-endian) | D834 DF11 |
| UTF-32 | 0001D311 |
| HTML decimal | 𝌑 |
| HTML hex | 𝌑 |
| CSS | \1D311 |
| JavaScript | \u{1D311} or \uD834\uDF11 |
| JSON | \uD834\uDF11 |
| Python | \U0001D311 |
| Python by name | \N{TETRAGRAM FOR YOUTHFULNESS} |
| Java, C# | \uD834\uDF11 |
| Rust, Swift | \u{1D311} |
| Go, C, C++ | \U0001D311 |
| URL (percent-encoded) | %F0%9D%8C%91 |
JavaScript and JSON strings store text as UTF-16, so this character takes two code units (a surrogate pair) and "π".length is 2. Python 3 strings count code points, so its length there is 1.
Properties
| Property | Value |
|---|---|
| Name | TETRAGRAM FOR YOUTHFULNESS |
| Code point | U+1D311 (decimal 119569) |
| Block | Tai Xuan Jing Symbols (U+1D300βU+1D35F) |
| General category | So: Other symbol |
| Script | Common |
| Bidirectional class | ON: Other neutral |
| Mirrored in right-to-left text | No |
| First in Unicode version | 4.0 |
Nearby in Tai Xuan Jing Symbols
- π U+1D309 Tetragram For Barrier
- π U+1D30A Tetragram For Keeping Small
- π U+1D30B Tetragram For Contrariety
- π U+1D30C Tetragram For Ascent
- π U+1D30D Tetragram For Opposition
- π U+1D30E Tetragram For Branching Out
- π U+1D30F Tetragram For Defectiveness Or Distortion
- π U+1D310 Tetragram For Divergence
- π U+1D312 Tetragram For Increase
- π U+1D313 Tetragram For Penetration
- π U+1D314 Tetragram For Reach
- π U+1D315 Tetragram For Contact
- π U+1D316 Tetragram For Holding Back
- π U+1D317 Tetragram For Waiting
- π U+1D318 Tetragram For Following
- π U+1D319 Tetragram For Advance
All 87 characters: Tai Xuan Jing Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝌑 (decimal) or 𝌑 (hex).
- What is the UTF-8 encoding of U+1D311?
- F0 9D 8C 91 (hex), 4 bytes. In a URL it is %F0%9D%8C%91.
- How do I write U+1D311 in JavaScript or Python?
- JavaScript: \u{1D311} or \uD834\uDF11. Python: \U0001D311.
Source
Unicode Character Database 18.0.0 (Unicode License v3); HTML entity names from the WHATWG HTML Standard (CC BY 4.0). The encodings above are computed from the code point and checked against Python's encoders. How the character looks depends on your fonts.
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