U+FF2F "Ｏ" Fullwidth Latin Capital Letter O Unicode Character
U+FF2F "Ｏ" Fullwidth Latin Capital Letter O is a typographic variant of the standard Latin capital letter O, designed to occupy the same width as CJK (Chinese, Japanese, and Korean) ideographic characters in monospaced or East Asian text environments. It is part of the Halfwidth and Fullwidth Forms block, where it was encoded to facilitate the visual alignment of Latin letters within Asian character grids, particularly in contexts like old computer terminals, early digital text, or mixed-script documents. This fullwidth version appears wider and more square than the regular halfwidth "O", and its usage ensures that when Latin text is interspersed with fullwidth Asian characters, the overall spacing remains uniform and aesthetically consistent.
General Properties
| Code Point | U+FF2F |
| Version Added | 1.1 |
| Name | Fullwidth Latin Capital Letter O |
| Block | Halfwidth and Fullwidth Forms |
| General Category | Uppercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Wide |
| Decomposition Mapping | "O" U+004F Latin Capital Letter O |
Encodings
| HTML Decimal Encoding | Ｏ |
| HTML Hex Encoding | Ｏ |
| UTF-8 Encoding | 0xEF 0xBC 0xAF |
| UTF-16 Encoding | 0xFF2F |
| UTF-32 Encoding | 0x0000FF2F |
| C/C++/Java Escape | \uff2f |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Ideographic |
| East Asian Width | Fullwidth |
| Uppercase | Yes |
| Simple Lowercase Code Point | "ｏ" U+FF4F Fullwidth Latin Small Letter O |
| Lowercase Code Point | "ｏ" U+FF4F Fullwidth Latin Small Letter O |
| Simple Case Folding | "ｏ" U+FF4F Fullwidth Latin Small Letter O |
| Case Folding | "ｏ" U+FF4F Fullwidth Latin Small Letter O |
| Cased | Yes |
| Changes When Casefolded | Yes |
| Changes When Casemapped | Yes |
| Changes When Lowercased | Yes |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "o" U+006F Latin Small Letter O |
| NFKC Simple Casefold | "o" U+006F Latin Small Letter O |
| 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 | Upright |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Alphabetic letter |
| Sentence Break | Upper |