U+00FF "ÿ" Latin Small Letter Y with Diaeresis Unicode Character
Unicode Version 17.0
ÿ
U+00FF "ÿ" Latin Small Letter Y with Diaeresis is a typographical variant of the letter y that features two dots, known as a diaeresis or umlaut, placed above it. This character is primarily used in the French and Welsh languages, where it indicates that the letter y is pronounced separately from a preceding vowel, as in the French word "crosby" or in Welsh names like "Ffowc" where it appears in certain orthographic contexts. It also occasionally appears in English in loanwords or proper names, such as the surname "Brontë" where the diaeresis marks a distinct syllable. The diaeresis on the y does not change the base sound of the letter but serves a specific diacritical function to guide pronunciation.
General Properties
| Code Point | U+00FF |
| Version Added | 1.1 |
| Name | Latin Small Letter Y with Diaeresis |
| Unicode 1.0 Name | Latin Small Letter Y Diaeresis |
| Block | Latin-1 Supplement |
| General Category | Lowercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Canonical |
| Decomposition Mapping | "y" U+0079 Latin Small Letter Y "̈" U+0308 Combining Diaeresis |
Encodings
| HTML Decimal Encoding | ÿ |
| HTML Hex Encoding | ÿ |
| UTF-8 Encoding | 0xC3 0xBF |
| UTF-16 Encoding | 0x00FF |
| UTF-32 Encoding | 0x000000FF |
| C/C++/Java Escape | \u00ff |
Unicode Properties
| NFC Quick Check | Yes |
| NFKC Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Lowercase | Yes |
| Simple Uppercase Code Point | "Ÿ" U+0178 Latin Capital Letter Y with Diaeresis |
| Simple Titlecase Code Point | "Ÿ" U+0178 Latin Capital Letter Y with Diaeresis |
| Uppercase Code Point | "Ÿ" U+0178 Latin Capital Letter Y with Diaeresis |
| Titlecase Code Point | "Ÿ" U+0178 Latin Capital Letter Y with Diaeresis |
| Cased | Yes |
| Changes When Casemapped | Yes |
| Changes When Titlecased | Yes |
| Changes When Uppercased | Yes |
| Script | Latin |
| Script Extensions | Latin |
| 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 |