U+0439 "й" Cyrillic Small Letter Short I Unicode Character
Unicode Version 17.0
й
U+0439 "й" Cyrillic Small Letter Short I is a letter in the Cyrillic script, representing the consonant sound /j/ (like the English "y" in "yes") and is derived from the Cyrillic letter и (I) with a breve diacritic to indicate its shortened or semivowel pronunciation. It is the eleventh letter in the Russian alphabet and is used in various other Cyrillic-based languages, including Ukrainian, Belarusian, and Bulgarian. When capitalized, it becomes the character "Й" (U+0419). The letter is visually distinct from the plain и by the small curved mark above it, known as a breve, which signals its different phonetic value in words.
General Properties
| Code Point | U+0439 |
| Version Added | 1.1 |
| Name | Cyrillic Small Letter Short I |
| Unicode 1.0 Name | Cyrillic Small Letter Short Ii |
| Block | Cyrillic |
| General Category | Lowercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Canonical |
| Decomposition Mapping | "и" U+0438 Cyrillic Small Letter I "̆" U+0306 Combining Breve |
Encodings
| HTML Decimal Encoding | й |
| HTML Hex Encoding | й |
| UTF-8 Encoding | 0xD0 0xB9 |
| UTF-16 Encoding | 0x0439 |
| UTF-32 Encoding | 0x00000439 |
| C/C++/Java Escape | \u0439 |
Unicode Properties
| NFC Quick Check | Yes |
| NFKC Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| East Asian Width | Ambiguous |
| Lowercase | Yes |
| Simple Uppercase Code Point | "Й" U+0419 Cyrillic Capital Letter Short I |
| Simple Titlecase Code Point | "Й" U+0419 Cyrillic Capital Letter Short I |
| Uppercase Code Point | "Й" U+0419 Cyrillic Capital Letter Short I |
| Titlecase Code Point | "Й" U+0419 Cyrillic Capital Letter Short I |
| Cased | Yes |
| Changes When Casemapped | Yes |
| Changes When Titlecased | Yes |
| Changes When Uppercased | Yes |
| Script | Cyrillic |
| Script Extensions | Cyrillic |
| Indic Syllabic Category | Other |
| ID Start | Yes |
| XID Start | Yes |
| ID Continue | Yes |
| XID Continue | Yes |
| Alphabetic | Yes |
| Vertical Orientation | Rotated |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Alphabetic letter |
| Sentence Break | Lower |