π is the Unicode character MATHEMATICAL SANS-SERIF BOLD ITALIC SMALL C, code point U+1D658 (decimal 120408) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝙘, and in UTF-8 it is the 4 bytes F0 9D 99 98.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D658 |
| Decimal | 120408 |
| UTF-8 bytes | F0 9D 99 98 |
| UTF-16 (big-endian) | D835 DE58 |
| UTF-32 | 0001D658 |
| HTML decimal | 𝙘 |
| HTML hex | 𝙘 |
| CSS | \1D658 |
| JavaScript | \u{1D658} or \uD835\uDE58 |
| JSON | \uD835\uDE58 |
| Python | \U0001D658 |
| Python by name | \N{MATHEMATICAL SANS-SERIF BOLD ITALIC SMALL C} |
| Java, C# | \uD835\uDE58 |
| Rust, Swift | \u{1D658} |
| Go, C, C++ | \U0001D658 |
| URL (percent-encoded) | %F0%9D%99%98 |
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 SMALL C |
| Code point | U+1D658 (decimal 120408) |
| 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 SANS-SERIF BOLD ITALIC SMALL C 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+1D650 Mathematical Sans-Serif Bold Italic Capital U
- π U+1D651 Mathematical Sans-Serif Bold Italic Capital V
- π U+1D652 Mathematical Sans-Serif Bold Italic Capital W
- π U+1D653 Mathematical Sans-Serif Bold Italic Capital X
- π U+1D654 Mathematical Sans-Serif Bold Italic Capital Y
- π U+1D655 Mathematical Sans-Serif Bold Italic Capital Z
- π U+1D656 Mathematical Sans-Serif Bold Italic Small A
- π U+1D657 Mathematical Sans-Serif Bold Italic Small B
- π U+1D659 Mathematical Sans-Serif Bold Italic Small D
- π U+1D65A Mathematical Sans-Serif Bold Italic Small E
- π U+1D65B Mathematical Sans-Serif Bold Italic Small F
- π U+1D65C Mathematical Sans-Serif Bold Italic Small G
- π U+1D65D Mathematical Sans-Serif Bold Italic Small H
- π U+1D65E Mathematical Sans-Serif Bold Italic Small I
- π U+1D65F Mathematical Sans-Serif Bold Italic Small J
- π U+1D660 Mathematical Sans-Serif Bold Italic Small K
All 997 characters: Mathematical Alphanumeric Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝙘 (decimal) or 𝙘 (hex).
- What is the UTF-8 encoding of U+1D658?
- F0 9D 99 98 (hex), 4 bytes. In a URL it is %F0%9D%99%98.
- How do I write U+1D658 in JavaScript or Python?
- JavaScript: \u{1D658} or \uD835\uDE58. Python: \U0001D658.
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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