π is the Unicode character MATHEMATICAL ITALIC CAPITAL O, code point U+1D442 (decimal 119874) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝑂, and in UTF-8 it is the 4 bytes F0 9D 91 82.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D442 |
| Decimal | 119874 |
| UTF-8 bytes | F0 9D 91 82 |
| UTF-16 (big-endian) | D835 DC42 |
| UTF-32 | 0001D442 |
| HTML decimal | 𝑂 |
| HTML hex | 𝑂 |
| CSS | \1D442 |
| JavaScript | \u{1D442} or \uD835\uDC42 |
| JSON | \uD835\uDC42 |
| Python | \U0001D442 |
| Python by name | \N{MATHEMATICAL ITALIC CAPITAL O} |
| Java, C# | \uD835\uDC42 |
| Rust, Swift | \u{1D442} |
| Go, C, C++ | \U0001D442 |
| URL (percent-encoded) | %F0%9D%91%82 |
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 CAPITAL O |
| Code point | U+1D442 (decimal 119874) |
| 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 ITALIC CAPITAL O 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
- πΊ U+1D43A Mathematical Italic Capital G
- π» U+1D43B Mathematical Italic Capital H
- πΌ U+1D43C Mathematical Italic Capital I
- π½ U+1D43D Mathematical Italic Capital J
- πΎ U+1D43E Mathematical Italic Capital K
- πΏ U+1D43F Mathematical Italic Capital L
- π U+1D440 Mathematical Italic Capital M
- π U+1D441 Mathematical Italic Capital N
- π U+1D443 Mathematical Italic Capital P
- π U+1D444 Mathematical Italic Capital Q
- π U+1D445 Mathematical Italic Capital R
- π U+1D446 Mathematical Italic Capital S
- 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
All 997 characters: Mathematical Alphanumeric Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝑂 (decimal) or 𝑂 (hex).
- What is the UTF-8 encoding of U+1D442?
- F0 9D 91 82 (hex), 4 bytes. In a URL it is %F0%9D%91%82.
- How do I write U+1D442 in JavaScript or Python?
- JavaScript: \u{1D442} or \uD835\uDC42. Python: \U0001D442.
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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