U+00D6 "Ö" Latin Capital Letter O with Diaeresis Unicode Character
U+00D6 "Ö" Latin Capital Letter O with Diaeresis is a grapheme used in several languages, most prominently in German, Swedish, Finnish, and Hungarian, where it represents a distinct vowel sound formed by rounding the lips while pronouncing an "e" sound, similar to the "ur" in "fur" in some English dialects. In German, it is considered a separate letter and often sorted alongside "O" in dictionaries, while in Swedish and Finnish it holds its own position in the alphabet after "O". Historically, the diaeresis (two dots) evolved from a small "e" written above the "O" to indicate umlaut, marking a fronting of the vowel. This character is also used in romanization systems for languages like Turkish and Azerbaijani, and it appears in loanwords in English, such as in the name "Zoë" or the rock band "Blue Öyster Cult."
General Properties
| Code Point | U+00D6 |
| Version Added | 1.1 |
| Name | Latin Capital Letter O with Diaeresis |
| Unicode 1.0 Name | Latin Capital Letter O Diaeresis |
| Block | Latin-1 Supplement |
| General Category | Uppercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Canonical |
| Decomposition Mapping | "O" U+004F Latin Capital Letter O "̈" U+0308 Combining Diaeresis |
Encodings
| HTML Decimal Encoding | Ö |
| HTML Hex Encoding | Ö |
| UTF-8 Encoding | 0xC3 0x96 |
| UTF-16 Encoding | 0x00D6 |
| UTF-32 Encoding | 0x000000D6 |
| C/C++/Java Escape | \u00d6 |
Unicode Properties
| NFC Quick Check | Yes |
| NFKC Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Uppercase | Yes |
| Simple Lowercase Code Point | "ö" U+00F6 Latin Small Letter O with Diaeresis |
| Lowercase Code Point | "ö" U+00F6 Latin Small Letter O with Diaeresis |
| Simple Case Folding | "ö" U+00F6 Latin Small Letter O with Diaeresis |
| Case Folding | "ö" U+00F6 Latin Small Letter O with Diaeresis |
| Cased | Yes |
| Changes When Casefolded | Yes |
| Changes When Casemapped | Yes |
| Changes When Lowercased | Yes |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "ö" U+00F6 Latin Small Letter O with Diaeresis |
| NFKC Simple Casefold | "ö" U+00F6 Latin Small Letter O with Diaeresis |
| 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 | Upper |