π is the Unicode character MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL R, code point U+1D64D (decimal 120397) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝙍, and in UTF-8 it is the 4 bytes F0 9D 99 8D.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D64D |
| Decimal | 120397 |
| UTF-8 bytes | F0 9D 99 8D |
| UTF-16 (big-endian) | D835 DE4D |
| UTF-32 | 0001D64D |
| HTML decimal | 𝙍 |
| HTML hex | 𝙍 |
| CSS | \1D64D |
| JavaScript | \u{1D64D} or \uD835\uDE4D |
| JSON | \uD835\uDE4D |
| Python | \U0001D64D |
| Python by name | \N{MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL R} |
| Java, C# | \uD835\uDE4D |
| Rust, Swift | \u{1D64D} |
| Go, C, C++ | \U0001D64D |
| URL (percent-encoded) | %F0%9D%99%8D |
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 ITALIC CAPITAL R |
| Code point | U+1D64D (decimal 120397) |
| 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 ITALIC CAPITAL R 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+1D645 Mathematical Sans-Serif Bold Italic Capital J
- π U+1D646 Mathematical Sans-Serif Bold Italic Capital K
- π U+1D647 Mathematical Sans-Serif Bold Italic Capital L
- π U+1D648 Mathematical Sans-Serif Bold Italic Capital M
- π U+1D649 Mathematical Sans-Serif Bold Italic Capital N
- π U+1D64A Mathematical Sans-Serif Bold Italic Capital O
- π U+1D64B Mathematical Sans-Serif Bold Italic Capital P
- π U+1D64C Mathematical Sans-Serif Bold Italic Capital Q
- π U+1D64E Mathematical Sans-Serif Bold Italic Capital S
- π U+1D64F Mathematical Sans-Serif Bold Italic Capital T
- π U+1D650 Mathematical Sans-Serif Bold Italic Capital U
- π U+1D651 Mathematical Sans-Serif Bold Italic Capital V
- π U+1D652 Mathematical Sans-Serif Bold Italic Capital W
- π U+1D653 Mathematical Sans-Serif Bold Italic Capital X
- π U+1D654 Mathematical Sans-Serif Bold Italic Capital Y
- π U+1D655 Mathematical Sans-Serif Bold Italic Capital Z
All 997 characters: Mathematical Alphanumeric Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝙍 (decimal) or 𝙍 (hex).
- What is the UTF-8 encoding of U+1D64D?
- F0 9D 99 8D (hex), 4 bytes. In a URL it is %F0%9D%99%8D.
- How do I write U+1D64D in JavaScript or Python?
- JavaScript: \u{1D64D} or \uD835\uDE4D. Python: \U0001D64D.
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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