π is the Unicode character MATHEMATICAL MONOSPACE SMALL U, code point U+1D69E (decimal 120478) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝚞, and in UTF-8 it is the 4 bytes F0 9D 9A 9E.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D69E |
| Decimal | 120478 |
| UTF-8 bytes | F0 9D 9A 9E |
| UTF-16 (big-endian) | D835 DE9E |
| UTF-32 | 0001D69E |
| HTML decimal | 𝚞 |
| HTML hex | 𝚞 |
| CSS | \1D69E |
| JavaScript | \u{1D69E} or \uD835\uDE9E |
| JSON | \uD835\uDE9E |
| Python | \U0001D69E |
| Python by name | \N{MATHEMATICAL MONOSPACE SMALL U} |
| Java, C# | \uD835\uDE9E |
| Rust, Swift | \u{1D69E} |
| Go, C, C++ | \U0001D69E |
| URL (percent-encoded) | %F0%9D%9A%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 MONOSPACE SMALL U |
| Code point | U+1D69E (decimal 120478) |
| 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 MONOSPACE SMALL U 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+1D696 Mathematical Monospace Small M
- π U+1D697 Mathematical Monospace Small N
- π U+1D698 Mathematical Monospace Small O
- π U+1D699 Mathematical Monospace Small P
- π U+1D69A Mathematical Monospace Small Q
- π U+1D69B Mathematical Monospace Small R
- π U+1D69C Mathematical Monospace Small S
- π U+1D69D Mathematical Monospace Small T
- π U+1D69F Mathematical Monospace Small V
- π U+1D6A0 Mathematical Monospace Small W
- π‘ U+1D6A1 Mathematical Monospace Small X
- π’ U+1D6A2 Mathematical Monospace Small Y
- π£ U+1D6A3 Mathematical Monospace Small Z
- π€ U+1D6A4 Mathematical Italic Small Dotless I
- π₯ U+1D6A5 Mathematical Italic Small Dotless J
- π¦ U+1D6A6 Mathematical Italic Small Ligature Long S With Descender S
All 997 characters: Mathematical Alphanumeric Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝚞 (decimal) or 𝚞 (hex).
- What is the UTF-8 encoding of U+1D69E?
- F0 9D 9A 9E (hex), 4 bytes. In a URL it is %F0%9D%9A%9E.
- How do I write U+1D69E in JavaScript or Python?
- JavaScript: \u{1D69E} or \uD835\uDE9E. Python: \U0001D69E.
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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