π is the Unicode emoji OLD KEY, code point U+1F5DD (decimal 128477) in the Miscellaneous Symbols and Pictographs block, added in Unicode 7.0. In HTML write 🗝, and in UTF-8 it is the 4 bytes F0 9F 97 9D.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1F5DD |
| Decimal | 128477 |
| UTF-8 bytes | F0 9F 97 9D |
| UTF-16 (big-endian) | D83D DDDD |
| UTF-32 | 0001F5DD |
| HTML decimal | 🗝 |
| HTML hex | 🗝 |
| CSS | \1F5DD |
| JavaScript | \u{1F5DD} or \uD83D\uDDDD |
| JSON | \uD83D\uDDDD |
| Python | \U0001F5DD |
| Python by name | \N{OLD KEY} |
| Java, C# | \uD83D\uDDDD |
| Rust, Swift | \u{1F5DD} |
| Go, C, C++ | \U0001F5DD |
| URL (percent-encoded) | %F0%9F%97%9D |
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 | OLD KEY |
| Emoji name | old key |
| Code point | U+1F5DD (decimal 128477) |
| Block | Miscellaneous Symbols and Pictographs (U+1F300βU+1F5FF) |
| General category | So: Other symbol |
| Script | Common |
| Bidirectional class | ON: Other neutral |
| Mirrored in right-to-left text | No |
| First in Unicode version | 7.0 |
Nearby in Miscellaneous Symbols and Pictographs
- π U+1F5D5 Minimize
- π U+1F5D6 Maximize
- π U+1F5D7 Overlap
- π U+1F5D8 Clockwise Right And Left Semicircle Arrows
- π U+1F5D9 Cancellation X
- π U+1F5DA Increase Font Size Symbol
- π U+1F5DB Decrease Font Size Symbol
- π U+1F5DC Clamp
- π U+1F5DE Rolled-up newspaper
- π U+1F5DF Page With Circled Text
- π U+1F5E0 Stock Chart
- π‘ U+1F5E1 Dagger
- π’ U+1F5E2 Lips
- π£ U+1F5E3 Speaking head
- π€ U+1F5E4 Three Rays Above
- π₯ U+1F5E5 Three Rays Below
All 768 characters: Miscellaneous Symbols and Pictographs.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 🗝 (decimal) or 🗝 (hex).
- What is the UTF-8 encoding of U+1F5DD?
- F0 9F 97 9D (hex), 4 bytes. In a URL it is %F0%9F%97%9D.
- How do I write U+1F5DD in JavaScript or Python?
- JavaScript: \u{1F5DD} or \uD83D\uDDDD. Python: \U0001F5DD.
Source
Unicode Character Database 18.0.0 (Unicode License v3) and the Unicode emoji test data; 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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