π is the Unicode emoji OCTAGONAL SIGN (βstop signβ), code point U+1F6D1 (decimal 128721) in the Transport and Map Symbols block, added in Unicode 9.0. In HTML write 🛑, and in UTF-8 it is the 4 bytes F0 9F 9B 91.
Codes
| Where | How to write it |
|---|---|
| Code point | U+1F6D1 |
| Decimal | 128721 |
| UTF-8 bytes | F0 9F 9B 91 |
| UTF-16 (big-endian) | D83D DED1 |
| UTF-32 | 0001F6D1 |
| HTML decimal | 🛑 |
| HTML hex | 🛑 |
| CSS | \1F6D1 |
| JavaScript | \u{1F6D1} or \uD83D\uDED1 |
| JSON | \uD83D\uDED1 |
| Python | \U0001F6D1 |
| Python by name | \N{OCTAGONAL SIGN} |
| Java, C# | \uD83D\uDED1 |
| Rust, Swift | \u{1F6D1} |
| Go, C, C++ | \U0001F6D1 |
| URL (percent-encoded) | %F0%9F%9B%91 |
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 | OCTAGONAL SIGN |
| Emoji name | stop sign |
| Code point | U+1F6D1 (decimal 128721) |
| Block | Transport and Map Symbols (U+1F680βU+1F6FF) |
| General category | So: Other symbol |
| Script | Common |
| Bidirectional class | ON: Other neutral |
| Mirrored in right-to-left text | No |
| First in Unicode version | 9.0 |
Nearby in Transport and Map Symbols
- π U+1F6C9 Boys Symbol
- π U+1F6CA Girls Symbol
- π U+1F6CB Couch and lamp
- π U+1F6CC Person in bed
- π U+1F6CD Shopping bags
- π U+1F6CE Bellhop bell
- π U+1F6CF Bed
- π U+1F6D0 Place of worship
- π U+1F6D2 Shopping cart
- π U+1F6D3 Stupa
- π U+1F6D4 Pagoda
- π U+1F6D5 Hindu temple
- π U+1F6D6 Hut
- π U+1F6D7 Elevator
- π U+1F6D8 Landslide
- π U+1F6D9 Lighthouse
All 120 characters: Transport and Map Symbols.
Official reference
Questions people ask
- What is the HTML code for π?
- Use 🛑 (decimal) or 🛑 (hex).
- What is the UTF-8 encoding of U+1F6D1?
- F0 9F 9B 91 (hex), 4 bytes. In a URL it is %F0%9F%9B%91.
- How do I write U+1F6D1 in JavaScript or Python?
- JavaScript: \u{1F6D1} or \uD83D\uDED1. Python: \U0001F6D1.
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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