й is the Unicode character CYRILLIC SMALL LETTER SHORT I, code point U+0439 (decimal 1081) in the Cyrillic block, added in Unicode 1.1. In HTML write й, and in UTF-8 it is the 2 bytes D0 B9.
Codes
| Where | How to write it |
|---|---|
| Code point | U+0439 |
| Decimal | 1081 |
| UTF-8 bytes | D0 B9 |
| UTF-16 (big-endian) | 0439 |
| UTF-32 | 00000439 |
| HTML decimal | й |
| HTML hex | й |
| HTML named | й |
| CSS | \439 |
| JavaScript | \u0439 |
| JSON | \u0439 |
| Python | \u0439 |
| Python by name | \N{CYRILLIC SMALL LETTER SHORT I} |
| Java, C# | \u0439 |
| Rust, Swift | \u{439} |
| Go, C, C++ | \u0439 |
| URL (percent-encoded) | %D0%B9 |
JavaScript and JSON strings store text as UTF-16, so this character is one code unit long. Python 3 strings count code points, so its length there is 1.
Properties
| Property | Value |
|---|---|
| Name | CYRILLIC SMALL LETTER SHORT I |
| Code point | U+0439 (decimal 1081) |
| Block | Cyrillic (U+0400–U+04FF) |
| General category | Ll: Lowercase letter |
| Script | Cyrillic |
| Bidirectional class | L: Left-to-right |
| Mirrored in right-to-left text | No |
| First in Unicode version | 1.1 |
Decomposition
CYRILLIC SMALL LETTER SHORT I is canonically equivalent to the sequence below. Normalising text to NFD splits it into these parts; NFC joins them back into U+0439. Search and comparison should normalise first, or the two spellings will not match.
Upper and lower case
- Й U+0419 Cyrillic Capital Letter Short I — Uppercase
Nearby in Cyrillic
- б U+0431 Cyrillic Small Letter Be
- в U+0432 Cyrillic Small Letter Ve
- г U+0433 Cyrillic Small Letter Ghe
- д U+0434 Cyrillic Small Letter De
- е U+0435 Cyrillic Small Letter Ie
- ж U+0436 Cyrillic Small Letter Zhe
- з U+0437 Cyrillic Small Letter Ze
- и U+0438 Cyrillic Small Letter I
- к U+043A Cyrillic Small Letter Ka
- л U+043B Cyrillic Small Letter El
- м U+043C Cyrillic Small Letter Em
- н U+043D Cyrillic Small Letter En
- о U+043E Cyrillic Small Letter O
- п U+043F Cyrillic Small Letter Pe
- р U+0440 Cyrillic Small Letter Er
- с U+0441 Cyrillic Small Letter Es
All 256 characters: Cyrillic.
Official reference
Questions people ask
- What is the HTML code for й?
- Use the named entity й, or й (decimal) or й (hex).
- What is the UTF-8 encoding of U+0439?
- D0 B9 (hex), 2 bytes. In a URL it is %D0%B9.
- How do I write U+0439 in JavaScript or Python?
- JavaScript: \u0439. Python: \u0439.
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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