π is the Unicode character MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL BETA, code point U+1D791 (decimal 120721) 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 9E 91.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D791 |
| Decimal | 120721 |
| UTF-8 bytes | F0 9D 9E 91 |
| UTF-16 (big-endian) | D835 DF91 |
| UTF-32 | 0001D791 |
| HTML decimal | 𝞑 |
| HTML hex | 𝞑 |
| CSS | \1D791 |
| JavaScript | \u{1D791} or \uD835\uDF91 |
| JSON | \uD835\uDF91 |
| Python | \U0001D791 |
| Python by name | \N{MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL BETA} |
| Java, C# | \uD835\uDF91 |
| Rust, Swift | \u{1D791} |
| Go, C, C++ | \U0001D791 |
| URL (percent-encoded) | %F0%9D%9E%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 | MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL BETA |
| Code point | U+1D791 (decimal 120721) |
| 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 SANS-SERIF 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+1D789 Mathematical Sans-Serif Bold Partial Differential
- π U+1D78A Mathematical Sans-Serif Bold Epsilon Symbol
- π U+1D78B Mathematical Sans-Serif Bold Theta Symbol
- π U+1D78C Mathematical Sans-Serif Bold Kappa Symbol
- π U+1D78D Mathematical Sans-Serif Bold Phi Symbol
- π U+1D78E Mathematical Sans-Serif Bold Rho Symbol
- π U+1D78F Mathematical Sans-Serif Bold Pi Symbol
- π U+1D790 Mathematical Sans-Serif Bold Italic Capital Alpha
- π U+1D792 Mathematical Sans-Serif Bold Italic Capital Gamma
- π U+1D793 Mathematical Sans-Serif Bold Italic Capital Delta
- π U+1D794 Mathematical Sans-Serif Bold Italic Capital Epsilon
- π U+1D795 Mathematical Sans-Serif Bold Italic Capital Zeta
- π U+1D796 Mathematical Sans-Serif Bold Italic Capital Eta
- π U+1D797 Mathematical Sans-Serif Bold Italic Capital Theta
- π U+1D798 Mathematical Sans-Serif Bold Italic Capital Iota
- π U+1D799 Mathematical Sans-Serif 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+1D791?
- F0 9D 9E 91 (hex), 4 bytes. In a URL it is %F0%9D%9E%91.
- How do I write U+1D791 in JavaScript or Python?
- JavaScript: \u{1D791} or \uD835\uDF91. Python: \U0001D791.
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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