U+01FF "ǿ" Latin Small Letter O with Stroke and Acute Unicode Character
Unicode Version 17.0
ǿ
U+01FF "ǿ" Latin Small Letter O with Stroke and Acute is a composite glyph used primarily in the phonemic transcription of certain Scandinavian languages, most notably to represent a specific front rounded vowel sound in Old Norse and modern linguistic studies. It combines a base letter o with a horizontal stroke through its center and an acute accent above, indicating a distinct phoneme that often results from historical vowel shifts or umlaut processes. This character is encoded in the Latin Extended-B block of Unicode and is sometimes applied in scholarly texts or dictionaries to denote a closed, stressed variant of the long o sound, though its usage remains narrow and specialized outside of linguistic or philological contexts.
General Properties
| Code Point | U+01FF |
| Version Added | 1.1 |
| Name | Latin Small Letter O with Stroke and Acute |
| Block | Latin Extended-B |
| General Category | Lowercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Canonical |
| Decomposition Mapping | "ø" U+00F8 Latin Small Letter O with Stroke "́" U+0301 Combining Acute Accent |
Encodings
| HTML Decimal Encoding | ǿ |
| HTML Hex Encoding | ǿ |
| UTF-8 Encoding | 0xC7 0xBF |
| UTF-16 Encoding | 0x01FF |
| UTF-32 Encoding | 0x000001FF |
| C/C++/Java Escape | \u01ff |
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 | "Ǿ" U+01FE Latin Capital Letter O with Stroke and Acute |
| Simple Titlecase Code Point | "Ǿ" U+01FE Latin Capital Letter O with Stroke and Acute |
| Uppercase Code Point | "Ǿ" U+01FE Latin Capital Letter O with Stroke and Acute |
| Titlecase Code Point | "Ǿ" U+01FE Latin Capital Letter O with Stroke and Acute |
| 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 |