π is the Unicode character MATHEMATICAL ITALIC SMALL B, code point U+1D44F (decimal 119887) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝑏, and in UTF-8 it is the 4 bytes F0 9D 91 8F.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D44F |
| Decimal | 119887 |
| UTF-8 bytes | F0 9D 91 8F |
| UTF-16 (big-endian) | D835 DC4F |
| UTF-32 | 0001D44F |
| HTML decimal | 𝑏 |
| HTML hex | 𝑏 |
| CSS | \1D44F |
| JavaScript | \u{1D44F} or \uD835\uDC4F |
| JSON | \uD835\uDC4F |
| Python | \U0001D44F |
| Python by name | \N{MATHEMATICAL ITALIC SMALL B} |
| Java, C# | \uD835\uDC4F |
| Rust, Swift | \u{1D44F} |
| Go, C, C++ | \U0001D44F |
| URL (percent-encoded) | %F0%9D%91%8F |
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 ITALIC SMALL B |
| Code point | U+1D44F (decimal 119887) |
| Block | Mathematical Alphanumeric Symbols (U+1D400βU+1D7FF) |
| General category | Ll: Lowercase letter |
| Script | Common |
| Bidirectional class | L: Left-to-right |
| Mirrored in right-to-left text | No |
| First in Unicode version | 3.1 |
Decomposition
MATHEMATICAL ITALIC SMALL B 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+1D447 Mathematical Italic Capital T
- π U+1D448 Mathematical Italic Capital U
- π U+1D449 Mathematical Italic Capital V
- π U+1D44A Mathematical Italic Capital W
- π U+1D44B Mathematical Italic Capital X
- π U+1D44C Mathematical Italic Capital Y
- π U+1D44D Mathematical Italic Capital Z
- π U+1D44E Mathematical Italic Small A
- π U+1D450 Mathematical Italic Small C
- π U+1D451 Mathematical Italic Small D
- π U+1D452 Mathematical Italic Small E
- π U+1D453 Mathematical Italic Small F
- π U+1D454 Mathematical Italic Small G
- π U+1D456 Mathematical Italic Small I
- π U+1D457 Mathematical Italic Small J
- π U+1D458 Mathematical Italic Small K
All 997 characters: Mathematical Alphanumeric Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝑏 (decimal) or 𝑏 (hex).
- What is the UTF-8 encoding of U+1D44F?
- F0 9D 91 8F (hex), 4 bytes. In a URL it is %F0%9D%91%8F.
- How do I write U+1D44F in JavaScript or Python?
- JavaScript: \u{1D44F} or \uD835\uDC4F. Python: \U0001D44F.
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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