π is the Unicode character MATHEMATICAL BOLD ITALIC SMALL F, code point U+1D487 (decimal 119943) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝒇, and in UTF-8 it is the 4 bytes F0 9D 92 87.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D487 |
| Decimal | 119943 |
| UTF-8 bytes | F0 9D 92 87 |
| UTF-16 (big-endian) | D835 DC87 |
| UTF-32 | 0001D487 |
| HTML decimal | 𝒇 |
| HTML hex | 𝒇 |
| CSS | \1D487 |
| JavaScript | \u{1D487} or \uD835\uDC87 |
| JSON | \uD835\uDC87 |
| Python | \U0001D487 |
| Python by name | \N{MATHEMATICAL BOLD ITALIC SMALL F} |
| Java, C# | \uD835\uDC87 |
| Rust, Swift | \u{1D487} |
| Go, C, C++ | \U0001D487 |
| URL (percent-encoded) | %F0%9D%92%87 |
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 ITALIC SMALL F |
| Code point | U+1D487 (decimal 119943) |
| 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 ITALIC SMALL F 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
- πΏ U+1D47F Mathematical Bold Italic Capital X
- π U+1D480 Mathematical Bold Italic Capital Y
- π U+1D481 Mathematical Bold Italic Capital Z
- π U+1D482 Mathematical Bold Italic Small A
- π U+1D483 Mathematical Bold Italic Small B
- π U+1D484 Mathematical Bold Italic Small C
- π U+1D485 Mathematical Bold Italic Small D
- π U+1D486 Mathematical Bold Italic Small E
- π U+1D488 Mathematical Bold Italic Small G
- π U+1D489 Mathematical Bold Italic Small H
- π U+1D48A Mathematical Bold Italic Small I
- π U+1D48B Mathematical Bold Italic Small J
- π U+1D48C Mathematical Bold Italic Small K
- π U+1D48D Mathematical Bold Italic Small L
- π U+1D48E Mathematical Bold Italic Small M
- π U+1D48F Mathematical Bold Italic Small N
All 997 characters: Mathematical Alphanumeric Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝒇 (decimal) or 𝒇 (hex).
- What is the UTF-8 encoding of U+1D487?
- F0 9D 92 87 (hex), 4 bytes. In a URL it is %F0%9D%92%87.
- How do I write U+1D487 in JavaScript or Python?
- JavaScript: \u{1D487} or \uD835\uDC87. Python: \U0001D487.
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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