π is the Unicode character MATHEMATICAL SANS-SERIF ITALIC CAPITAL B, code point U+1D609 (decimal 120329) 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 98 89.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D609 |
| Decimal | 120329 |
| UTF-8 bytes | F0 9D 98 89 |
| UTF-16 (big-endian) | D835 DE09 |
| UTF-32 | 0001D609 |
| HTML decimal | 𝘉 |
| HTML hex | 𝘉 |
| CSS | \1D609 |
| JavaScript | \u{1D609} or \uD835\uDE09 |
| JSON | \uD835\uDE09 |
| Python | \U0001D609 |
| Python by name | \N{MATHEMATICAL SANS-SERIF ITALIC CAPITAL B} |
| Java, C# | \uD835\uDE09 |
| Rust, Swift | \u{1D609} |
| Go, C, C++ | \U0001D609 |
| URL (percent-encoded) | %F0%9D%98%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 SANS-SERIF ITALIC CAPITAL B |
| Code point | U+1D609 (decimal 120329) |
| 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 ITALIC CAPITAL 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+1D601 Mathematical Sans-Serif Bold Small T
- π U+1D602 Mathematical Sans-Serif Bold Small U
- π U+1D603 Mathematical Sans-Serif Bold Small V
- π U+1D604 Mathematical Sans-Serif Bold Small W
- π U+1D605 Mathematical Sans-Serif Bold Small X
- π U+1D606 Mathematical Sans-Serif Bold Small Y
- π U+1D607 Mathematical Sans-Serif Bold Small Z
- π U+1D608 Mathematical Sans-Serif Italic Capital A
- π U+1D60A Mathematical Sans-Serif Italic Capital C
- π U+1D60B Mathematical Sans-Serif Italic Capital D
- π U+1D60C Mathematical Sans-Serif Italic Capital E
- π U+1D60D Mathematical Sans-Serif Italic Capital F
- π U+1D60E Mathematical Sans-Serif Italic Capital G
- π U+1D60F Mathematical Sans-Serif Italic Capital H
- π U+1D610 Mathematical Sans-Serif Italic Capital I
- π U+1D611 Mathematical Sans-Serif Italic Capital J
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+1D609?
- F0 9D 98 89 (hex), 4 bytes. In a URL it is %F0%9D%98%89.
- How do I write U+1D609 in JavaScript or Python?
- JavaScript: \u{1D609} or \uD835\uDE09. Python: \U0001D609.
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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