π is the Unicode character MATHEMATICAL BOLD SMALL F, code point U+1D41F (decimal 119839) 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 90 9F.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D41F |
| Decimal | 119839 |
| UTF-8 bytes | F0 9D 90 9F |
| UTF-16 (big-endian) | D835 DC1F |
| UTF-32 | 0001D41F |
| HTML decimal | 𝐟 |
| HTML hex | 𝐟 |
| CSS | \1D41F |
| JavaScript | \u{1D41F} or \uD835\uDC1F |
| JSON | \uD835\uDC1F |
| Python | \U0001D41F |
| Python by name | \N{MATHEMATICAL BOLD SMALL F} |
| Java, C# | \uD835\uDC1F |
| Rust, Swift | \u{1D41F} |
| Go, C, C++ | \U0001D41F |
| URL (percent-encoded) | %F0%9D%90%9F |
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 SMALL F |
| Code point | U+1D41F (decimal 119839) |
| 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 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
- π U+1D417 Mathematical Bold Capital X
- π U+1D418 Mathematical Bold Capital Y
- π U+1D419 Mathematical Bold Capital Z
- π U+1D41A Mathematical Bold Small A
- π U+1D41B Mathematical Bold Small B
- π U+1D41C Mathematical Bold Small C
- π U+1D41D Mathematical Bold Small D
- π U+1D41E Mathematical Bold Small E
- π U+1D420 Mathematical Bold Small G
- π‘ U+1D421 Mathematical Bold Small H
- π’ U+1D422 Mathematical Bold Small I
- π£ U+1D423 Mathematical Bold Small J
- π€ U+1D424 Mathematical Bold Small K
- π₯ U+1D425 Mathematical Bold Small L
- π¦ U+1D426 Mathematical Bold Small M
- π§ U+1D427 Mathematical Bold 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+1D41F?
- F0 9D 90 9F (hex), 4 bytes. In a URL it is %F0%9D%90%9F.
- How do I write U+1D41F in JavaScript or Python?
- JavaScript: \u{1D41F} or \uD835\uDC1F. Python: \U0001D41F.
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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