π is the Unicode character MATHEMATICAL BOLD CAPITAL E, code point U+1D404 (decimal 119812) in the Mathematical Alphanumeric Symbols block, added in Unicode 3.1. In HTML write 𝐄, and in UTF-8 it is the 4 bytes F0 9D 90 84.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1D404 |
| Decimal | 119812 |
| UTF-8 bytes | F0 9D 90 84 |
| UTF-16 (big-endian) | D835 DC04 |
| UTF-32 | 0001D404 |
| HTML decimal | 𝐄 |
| HTML hex | 𝐄 |
| CSS | \1D404 |
| JavaScript | \u{1D404} or \uD835\uDC04 |
| JSON | \uD835\uDC04 |
| Python | \U0001D404 |
| Python by name | \N{MATHEMATICAL BOLD CAPITAL E} |
| Java, C# | \uD835\uDC04 |
| Rust, Swift | \u{1D404} |
| Go, C, C++ | \U0001D404 |
| URL (percent-encoded) | %F0%9D%90%84 |
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 CAPITAL E |
| Code point | U+1D404 (decimal 119812) |
| 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 BOLD CAPITAL E 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+1D400 Mathematical Bold Capital A
- π U+1D401 Mathematical Bold Capital B
- π U+1D402 Mathematical Bold Capital C
- π U+1D403 Mathematical Bold Capital D
- π U+1D405 Mathematical Bold Capital F
- π U+1D406 Mathematical Bold Capital G
- π U+1D407 Mathematical Bold Capital H
- π U+1D408 Mathematical Bold Capital I
- π U+1D409 Mathematical Bold Capital J
- π U+1D40A Mathematical Bold Capital K
- π U+1D40B Mathematical Bold Capital L
- π U+1D40C Mathematical Bold Capital M
All 997 characters: Mathematical Alphanumeric Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 𝐄 (decimal) or 𝐄 (hex).
- What is the UTF-8 encoding of U+1D404?
- F0 9D 90 84 (hex), 4 bytes. In a URL it is %F0%9D%90%84.
- How do I write U+1D404 in JavaScript or Python?
- JavaScript: \u{1D404} or \uD835\uDC04. Python: \U0001D404.
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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