π is the Unicode character MATHEMATICAL BOLD ITALIC SMALL SIGMA, code point U+1D748 (decimal 120648) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝝈, and in UTF-8 it is the 4 bytes F0 9D 9D 88.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D748 |
| Decimal | 120648 |
| UTF-8 bytes | F0 9D 9D 88 |
| UTF-16 (big-endian) | D835 DF48 |
| UTF-32 | 0001D748 |
| HTML decimal | 𝝈 |
| HTML hex | 𝝈 |
| CSS | \1D748 |
| JavaScript | \u{1D748} or \uD835\uDF48 |
| JSON | \uD835\uDF48 |
| Python | \U0001D748 |
| Python by name | \N{MATHEMATICAL BOLD ITALIC SMALL SIGMA} |
| Java, C# | \uD835\uDF48 |
| Rust, Swift | \u{1D748} |
| Go, C, C++ | \U0001D748 |
| URL (percent-encoded) | %F0%9D%9D%88 |
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 SIGMA |
| Code point | U+1D748 (decimal 120648) |
| 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 SIGMA 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+1D740 Mathematical Bold Italic Small Lamda
- π U+1D741 Mathematical Bold Italic Small Mu
- π U+1D742 Mathematical Bold Italic Small Nu
- π U+1D743 Mathematical Bold Italic Small Xi
- π U+1D744 Mathematical Bold Italic Small Omicron
- π U+1D745 Mathematical Bold Italic Small Pi
- π U+1D746 Mathematical Bold Italic Small Rho
- π U+1D747 Mathematical Bold Italic Small Final Sigma
- π U+1D749 Mathematical Bold Italic Small Tau
- π U+1D74A Mathematical Bold Italic Small Upsilon
- π U+1D74B Mathematical Bold Italic Small Phi
- π U+1D74C Mathematical Bold Italic Small Chi
- π U+1D74D Mathematical Bold Italic Small Psi
- π U+1D74E Mathematical Bold Italic Small Omega
- π U+1D74F Mathematical Bold Italic Partial Differential
- π U+1D750 Mathematical Bold Italic Epsilon Symbol
All 997 characters: Mathematical Alphanumeric Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝝈 (decimal) or 𝝈 (hex).
- What is the UTF-8 encoding of U+1D748?
- F0 9D 9D 88 (hex), 4 bytes. In a URL it is %F0%9D%9D%88.
- How do I write U+1D748 in JavaScript or Python?
- JavaScript: \u{1D748} or \uD835\uDF48. Python: \U0001D748.
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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