π is the Unicode character MATHEMATICAL BOLD ITALIC CAPITAL BETA, code point U+1D71D (decimal 120605) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝜝, and in UTF-8 it is the 4 bytes F0 9D 9C 9D.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D71D |
| Decimal | 120605 |
| UTF-8 bytes | F0 9D 9C 9D |
| UTF-16 (big-endian) | D835 DF1D |
| UTF-32 | 0001D71D |
| HTML decimal | 𝜝 |
| HTML hex | 𝜝 |
| CSS | \1D71D |
| JavaScript | \u{1D71D} or \uD835\uDF1D |
| JSON | \uD835\uDF1D |
| Python | \U0001D71D |
| Python by name | \N{MATHEMATICAL BOLD ITALIC CAPITAL BETA} |
| Java, C# | \uD835\uDF1D |
| Rust, Swift | \u{1D71D} |
| Go, C, C++ | \U0001D71D |
| URL (percent-encoded) | %F0%9D%9C%9D |
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 | MATHEMATICAL BOLD ITALIC CAPITAL BETA |
| Code point | U+1D71D (decimal 120605) |
| Block | Mathematical Alphanumeric Symbols (U+1D400βU+1D7FF) |
| General category | Lu: Uppercase letter |
| Script | Common |
| Bidirectional class | L: Left-to-right |
| Mirrored in right-to-left text | No |
| First in Unicode version | 3.1 |
Decomposition
MATHEMATICAL BOLD ITALIC CAPITAL BETA has a compatibility decomposition (font) to the sequence below. NFKC and NFKD normalisation replace it with that sequence, which can change how text looks, so use them for search, not for storage.
Nearby in Mathematical Alphanumeric Symbols
- π U+1D715 Mathematical Italic Partial Differential
- π U+1D716 Mathematical Italic Epsilon Symbol
- π U+1D717 Mathematical Italic Theta Symbol
- π U+1D718 Mathematical Italic Kappa Symbol
- π U+1D719 Mathematical Italic Phi Symbol
- π U+1D71A Mathematical Italic Rho Symbol
- π U+1D71B Mathematical Italic Pi Symbol
- π U+1D71C Mathematical Bold Italic Capital Alpha
- π U+1D71E Mathematical Bold Italic Capital Gamma
- π U+1D71F Mathematical Bold Italic Capital Delta
- π U+1D720 Mathematical Bold Italic Capital Epsilon
- π‘ U+1D721 Mathematical Bold Italic Capital Zeta
- π’ U+1D722 Mathematical Bold Italic Capital Eta
- π£ U+1D723 Mathematical Bold Italic Capital Theta
- π€ U+1D724 Mathematical Bold Italic Capital Iota
- π₯ U+1D725 Mathematical Bold Italic Capital Kappa
All 997 characters: Mathematical Alphanumeric Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝜝 (decimal) or 𝜝 (hex).
- What is the UTF-8 encoding of U+1D71D?
- F0 9D 9C 9D (hex), 4 bytes. In a URL it is %F0%9D%9C%9D.
- How do I write U+1D71D in JavaScript or Python?
- JavaScript: \u{1D71D} or \uD835\uDF1D. Python: \U0001D71D.
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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