π is the Unicode character MATHEMATICAL BOLD ITALIC SMALL Y, code point U+1D49A (decimal 119962) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝒚, and in UTF-8 it is the 4 bytes F0 9D 92 9A.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D49A |
| Decimal | 119962 |
| UTF-8 bytes | F0 9D 92 9A |
| UTF-16 (big-endian) | D835 DC9A |
| UTF-32 | 0001D49A |
| HTML decimal | 𝒚 |
| HTML hex | 𝒚 |
| CSS | \1D49A |
| JavaScript | \u{1D49A} or \uD835\uDC9A |
| JSON | \uD835\uDC9A |
| Python | \U0001D49A |
| Python by name | \N{MATHEMATICAL BOLD ITALIC SMALL Y} |
| Java, C# | \uD835\uDC9A |
| Rust, Swift | \u{1D49A} |
| Go, C, C++ | \U0001D49A |
| URL (percent-encoded) | %F0%9D%92%9A |
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 Y |
| Code point | U+1D49A (decimal 119962) |
| 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 Y 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+1D492 Mathematical Bold Italic Small Q
- π U+1D493 Mathematical Bold Italic Small R
- π U+1D494 Mathematical Bold Italic Small S
- π U+1D495 Mathematical Bold Italic Small T
- π U+1D496 Mathematical Bold Italic Small U
- π U+1D497 Mathematical Bold Italic Small V
- π U+1D498 Mathematical Bold Italic Small W
- π U+1D499 Mathematical Bold Italic Small X
- π U+1D49B Mathematical Bold Italic Small Z
- π U+1D49C Mathematical Script Capital A
- π U+1D49E Mathematical Script Capital C
- π U+1D49F Mathematical Script Capital D
- π’ U+1D4A2 Mathematical Script Capital G
- π₯ U+1D4A5 Mathematical Script Capital J
- π¦ U+1D4A6 Mathematical Script Capital K
- π© U+1D4A9 Mathematical Script Capital N
All 997 characters: Mathematical Alphanumeric Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝒚 (decimal) or 𝒚 (hex).
- What is the UTF-8 encoding of U+1D49A?
- F0 9D 92 9A (hex), 4 bytes. In a URL it is %F0%9D%92%9A.
- How do I write U+1D49A in JavaScript or Python?
- JavaScript: \u{1D49A} or \uD835\uDC9A. Python: \U0001D49A.
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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