π is the Unicode character MATHEMATICAL BOLD FRAKTUR SMALL D, code point U+1D589 (decimal 120201) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝖉, and in UTF-8 it is the 4 bytes F0 9D 96 89.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D589 |
| Decimal | 120201 |
| UTF-8 bytes | F0 9D 96 89 |
| UTF-16 (big-endian) | D835 DD89 |
| UTF-32 | 0001D589 |
| HTML decimal | 𝖉 |
| HTML hex | 𝖉 |
| CSS | \1D589 |
| JavaScript | \u{1D589} or \uD835\uDD89 |
| JSON | \uD835\uDD89 |
| Python | \U0001D589 |
| Python by name | \N{MATHEMATICAL BOLD FRAKTUR SMALL D} |
| Java, C# | \uD835\uDD89 |
| Rust, Swift | \u{1D589} |
| Go, C, C++ | \U0001D589 |
| URL (percent-encoded) | %F0%9D%96%89 |
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 FRAKTUR SMALL D |
| Code point | U+1D589 (decimal 120201) |
| 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 BOLD FRAKTUR SMALL D 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+1D581 Mathematical Bold Fraktur Capital V
- π U+1D582 Mathematical Bold Fraktur Capital W
- π U+1D583 Mathematical Bold Fraktur Capital X
- π U+1D584 Mathematical Bold Fraktur Capital Y
- π U+1D585 Mathematical Bold Fraktur Capital Z
- π U+1D586 Mathematical Bold Fraktur Small A
- π U+1D587 Mathematical Bold Fraktur Small B
- π U+1D588 Mathematical Bold Fraktur Small C
- π U+1D58A Mathematical Bold Fraktur Small E
- π U+1D58B Mathematical Bold Fraktur Small F
- π U+1D58C Mathematical Bold Fraktur Small G
- π U+1D58D Mathematical Bold Fraktur Small H
- π U+1D58E Mathematical Bold Fraktur Small I
- π U+1D58F Mathematical Bold Fraktur Small J
- π U+1D590 Mathematical Bold Fraktur Small K
- π U+1D591 Mathematical Bold Fraktur Small L
All 997 characters: Mathematical Alphanumeric Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝖉 (decimal) or 𝖉 (hex).
- What is the UTF-8 encoding of U+1D589?
- F0 9D 96 89 (hex), 4 bytes. In a URL it is %F0%9D%96%89.
- How do I write U+1D589 in JavaScript or Python?
- JavaScript: \u{1D589} or \uD835\uDD89. Python: \U0001D589.
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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