π is the Unicode character MATHEMATICAL SANS-SERIF BOLD CAPITAL B, code point U+1D5D5 (decimal 120277) 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 97 95.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D5D5 |
| Decimal | 120277 |
| UTF-8 bytes | F0 9D 97 95 |
| UTF-16 (big-endian) | D835 DDD5 |
| UTF-32 | 0001D5D5 |
| HTML decimal | 𝗕 |
| HTML hex | 𝗕 |
| CSS | \1D5D5 |
| JavaScript | \u{1D5D5} or \uD835\uDDD5 |
| JSON | \uD835\uDDD5 |
| Python | \U0001D5D5 |
| Python by name | \N{MATHEMATICAL SANS-SERIF BOLD CAPITAL B} |
| Java, C# | \uD835\uDDD5 |
| Rust, Swift | \u{1D5D5} |
| Go, C, C++ | \U0001D5D5 |
| URL (percent-encoded) | %F0%9D%97%95 |
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 BOLD CAPITAL B |
| Code point | U+1D5D5 (decimal 120277) |
| 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 BOLD 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+1D5CD Mathematical Sans-Serif Small T
- π U+1D5CE Mathematical Sans-Serif Small U
- π U+1D5CF Mathematical Sans-Serif Small V
- π U+1D5D0 Mathematical Sans-Serif Small W
- π U+1D5D1 Mathematical Sans-Serif Small X
- π U+1D5D2 Mathematical Sans-Serif Small Y
- π U+1D5D3 Mathematical Sans-Serif Small Z
- π U+1D5D4 Mathematical Sans-Serif Bold Capital A
- π U+1D5D6 Mathematical Sans-Serif Bold Capital C
- π U+1D5D7 Mathematical Sans-Serif Bold Capital D
- π U+1D5D8 Mathematical Sans-Serif Bold Capital E
- π U+1D5D9 Mathematical Sans-Serif Bold Capital F
- π U+1D5DA Mathematical Sans-Serif Bold Capital G
- π U+1D5DB Mathematical Sans-Serif Bold Capital H
- π U+1D5DC Mathematical Sans-Serif Bold Capital I
- π U+1D5DD Mathematical Sans-Serif Bold 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+1D5D5?
- F0 9D 97 95 (hex), 4 bytes. In a URL it is %F0%9D%97%95.
- How do I write U+1D5D5 in JavaScript or Python?
- JavaScript: \u{1D5D5} or \uD835\uDDD5. Python: \U0001D5D5.
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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