π is the Unicode character MATHEMATICAL DOUBLE-STRUCK DIGIT SIX, code point U+1D7DE (decimal 120798) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝟞, and in UTF-8 it is the 4 bytes F0 9D 9F 9E.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D7DE |
| Decimal | 120798 |
| UTF-8 bytes | F0 9D 9F 9E |
| UTF-16 (big-endian) | D835 DFDE |
| UTF-32 | 0001D7DE |
| HTML decimal | 𝟞 |
| HTML hex | 𝟞 |
| CSS | \1D7DE |
| JavaScript | \u{1D7DE} or \uD835\uDFDE |
| JSON | \uD835\uDFDE |
| Python | \U0001D7DE |
| Python by name | \N{MATHEMATICAL DOUBLE-STRUCK DIGIT SIX} |
| Java, C# | \uD835\uDFDE |
| Rust, Swift | \u{1D7DE} |
| Go, C, C++ | \U0001D7DE |
| URL (percent-encoded) | %F0%9D%9F%9E |
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 DOUBLE-STRUCK DIGIT SIX |
| Code point | U+1D7DE (decimal 120798) |
| Block | Mathematical Alphanumeric Symbols (U+1D400βU+1D7FF) |
| General category | Nd: Decimal digit |
| Script | Common |
| Bidirectional class | EN: European number |
| Numeric value | 6 |
| Mirrored in right-to-left text | No |
| First in Unicode version | 3.1 |
Decomposition
MATHEMATICAL DOUBLE-STRUCK DIGIT SIX 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+1D7D6 Mathematical Bold Digit Eight
- π U+1D7D7 Mathematical Bold Digit Nine
- π U+1D7D8 Mathematical Double-Struck Digit Zero
- π U+1D7D9 Mathematical Double-Struck Digit One
- π U+1D7DA Mathematical Double-Struck Digit Two
- π U+1D7DB Mathematical Double-Struck Digit Three
- π U+1D7DC Mathematical Double-Struck Digit Four
- π U+1D7DD Mathematical Double-Struck Digit Five
- π U+1D7DF Mathematical Double-Struck Digit Seven
- π U+1D7E0 Mathematical Double-Struck Digit Eight
- π‘ U+1D7E1 Mathematical Double-Struck Digit Nine
- π’ U+1D7E2 Mathematical Sans-Serif Digit Zero
- π£ U+1D7E3 Mathematical Sans-Serif Digit One
- π€ U+1D7E4 Mathematical Sans-Serif Digit Two
- π₯ U+1D7E5 Mathematical Sans-Serif Digit Three
- π¦ U+1D7E6 Mathematical Sans-Serif Digit Four
All 997 characters: Mathematical Alphanumeric Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝟞 (decimal) or 𝟞 (hex).
- What is the UTF-8 encoding of U+1D7DE?
- F0 9D 9F 9E (hex), 4 bytes. In a URL it is %F0%9D%9F%9E.
- How do I write U+1D7DE in JavaScript or Python?
- JavaScript: \u{1D7DE} or \uD835\uDFDE. Python: \U0001D7DE.
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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