Ё is the Unicode character CYRILLIC CAPITAL LETTER IO, code point U+0401 (decimal 1025) in the Cyrillic block, added in Unicode 1.1. In HTML write Ё, and in UTF-8 it is the 2 bytes D0 81.
Codes
| Where | How to write it |
|---|---|
| Code point | U+0401 |
| Decimal | 1025 |
| UTF-8 bytes | D0 81 |
| UTF-16 (big-endian) | 0401 |
| UTF-32 | 00000401 |
| HTML decimal | Ё |
| HTML hex | Ё |
| HTML named | Ё |
| CSS | \401 |
| JavaScript | \u0401 |
| JSON | \u0401 |
| Python | \u0401 |
| Python by name | \N{CYRILLIC CAPITAL LETTER IO} |
| Java, C# | \u0401 |
| Rust, Swift | \u{401} |
| Go, C, C++ | \u0401 |
| URL (percent-encoded) | %D0%81 |
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 CAPITAL LETTER IO |
| Code point | U+0401 (decimal 1025) |
| Block | Cyrillic (U+0400–U+04FF) |
| General category | Lu: Uppercase letter |
| Script | Cyrillic |
| Bidirectional class | L: Left-to-right |
| Mirrored in right-to-left text | No |
| First in Unicode version | 1.1 |
Decomposition
CYRILLIC CAPITAL LETTER IO is canonically equivalent to the sequence below. Normalising text to NFD splits it into these parts; NFC joins them back into U+0401. Search and comparison should normalise first, or the two spellings will not match.
Upper and lower case
- ё U+0451 Cyrillic Small Letter Io — Lowercase
Nearby in Cyrillic
- Ѐ U+0400 Cyrillic Capital Letter Ie With Grave
- Ђ U+0402 Cyrillic Capital Letter Dje
- Ѓ U+0403 Cyrillic Capital Letter Gje
- Є U+0404 Cyrillic Capital Letter Ukrainian Ie
- Ѕ U+0405 Cyrillic Capital Letter Dze
- І U+0406 Cyrillic Capital Letter Byelorussian-Ukrainian I
- Ї U+0407 Cyrillic Capital Letter Yi
- Ј U+0408 Cyrillic Capital Letter Je
- Љ U+0409 Cyrillic Capital Letter Lje
All 256 characters: Cyrillic.
Official reference
Questions people ask
- What is the HTML code for Ё?
- Use the named entity Ё, or Ё (decimal) or Ё (hex).
- What is the UTF-8 encoding of U+0401?
- D0 81 (hex), 2 bytes. In a URL it is %D0%81.
- How do I write U+0401 in JavaScript or Python?
- JavaScript: \u0401. Python: \u0401.
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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