U+0424 "Ф" Cyrillic Capital Letter Ef Unicode Character
U+0424 "Ф" Cyrillic Capital Letter Ef is a letter used in several Cyrillic alphabets, most notably in Russian, Ukrainian, Bulgarian, and Serbian, where it represents the voiceless labiodental fricative sound /f/, akin to the English "f" in "fox." Its visual form is distinct, featuring a vertical stem with a small circle or loop on each side, which differentiates it from the Latin alphabet. Historically, this letter derives from the Greek letter phi (Φ), and it is typically used in loanwords, foreign names, and a limited number of native words, as the sound /f/ is not originally common in Slavic languages. In digital contexts, it is encoded in the Unicode Standard as part of the Cyrillic block, with a capital form at U+0424 and a lowercase form at U+0444.
General Properties
| Code Point | U+0424 |
| Version Added | 1.1 |
| Name | Cyrillic Capital Letter Ef |
| Block | Cyrillic |
| General Category | Uppercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
Encodings
| HTML Decimal Encoding | Ф |
| HTML Hex Encoding | Ф |
| UTF-8 Encoding | 0xD0 0xA4 |
| UTF-16 Encoding | 0x0424 |
| UTF-32 Encoding | 0x00000424 |
| C/C++/Java Escape | \u0424 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| NFKC Quick Check | Yes |
| NFKD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| East Asian Width | Ambiguous |
| Uppercase | Yes |
| Simple Lowercase Code Point | "ф" U+0444 Cyrillic Small Letter Ef |
| Lowercase Code Point | "ф" U+0444 Cyrillic Small Letter Ef |
| Simple Case Folding | "ф" U+0444 Cyrillic Small Letter Ef |
| Case Folding | "ф" U+0444 Cyrillic Small Letter Ef |
| Cased | Yes |
| Changes When Casefolded | Yes |
| Changes When Casemapped | Yes |
| Changes When Lowercased | Yes |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "ф" U+0444 Cyrillic Small Letter Ef |
| NFKC Simple Casefold | "ф" U+0444 Cyrillic Small Letter Ef |
| 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 | Upper |