U+2168 "Ⅸ" Roman Numeral Nine Unicode Character
U+2168 "Ⅸ" Roman Numeral Nine is a typographic representation of the number nine in the ancient Roman numeral system, formed by the subtractive combination of a numeral for one (I) placed before the numeral for ten (X) to indicate the value nine. This specific character resides in the Number Forms block of Unicode, designed to ensure consistent visual alignment among Roman numerals in digital text, especially when used in contexts like clock faces, outlines, or formal numbering systems. Unlike the separate letters I and X typed in sequence, this single glyph presents a unified symbol that maintains proportional spacing and avoids visual gaps, making it particularly useful in typography and design where a cohesive numeral appearance is required.
General Properties
| Code Point | U+2168 |
| Version Added | 1.1 |
| Name | Roman Numeral Nine |
| Block | Number Forms |
| General Category | Letter Number |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Compat |
| Decomposition Mapping | "I" U+0049 Latin Capital Letter I "X" U+0058 Latin Capital Letter X |
Encodings
| HTML Decimal Encoding | Ⅸ |
| HTML Hex Encoding | Ⅸ |
| UTF-8 Encoding | 0xE2 0x85 0xA8 |
| UTF-16 Encoding | 0x2168 |
| UTF-32 Encoding | 0x00002168 |
| C/C++/Java Escape | \u2168 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | Numeric |
| Numeric Value | 9 |
| Line Break | Ambiguous (Alphabetic or Ideographic) |
| East Asian Width | Ambiguous |
| Uppercase | Yes |
| Other Uppercase | Yes |
| Simple Lowercase Code Point | "ⅸ" U+2178 Small Roman Numeral Nine |
| Lowercase Code Point | "ⅸ" U+2178 Small Roman Numeral Nine |
| Simple Case Folding | "ⅸ" U+2178 Small Roman Numeral Nine |
| Case Folding | "ⅸ" U+2178 Small Roman Numeral Nine |
| Cased | Yes |
| Changes When Casefolded | Yes |
| Changes When Casemapped | Yes |
| Changes When Lowercased | Yes |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "i" U+0069 Latin Small Letter I "x" U+0078 Latin Small Letter X |
| NFKC Simple Casefold | "i" U+0069 Latin Small Letter I "x" U+0078 Latin Small Letter X |
| 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 |