U+2160 "Ⅰ" Roman Numeral One Unicode Character
Unicode Version 17.0
Ⅰ
U+2160 "Ⅰ" Roman Numeral One is a typographic representation of the number one in the ancient Roman numeral system, distinct from the capital letter "I" to ensure consistent rendering in digital text, especially in contexts like clock faces, outlines, or formal enumerations. It belongs to the Number Forms Unicode block, which provides separate code points for standard Roman numeral characters to avoid confusion with alphabetic letters. This character is typically displayed with similar spacing and proportion to other Roman numeral symbols, such as Ⅴ and Ⅹ, making it ideal for historical, mathematical, or decorative uses where precise numeral styling is required.
General Properties
| Code Point | U+2160 |
| Version Added | 1.1 |
| Name | Roman Numeral One |
| 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 |
Encodings
| HTML Decimal Encoding | Ⅰ |
| HTML Hex Encoding | Ⅰ |
| UTF-8 Encoding | 0xE2 0x85 0xA0 |
| UTF-16 Encoding | 0x2160 |
| UTF-32 Encoding | 0x00002160 |
| C/C++/Java Escape | \u2160 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | Numeric |
| Numeric Value | 1 |
| Line Break | Ambiguous (Alphabetic or Ideographic) |
| East Asian Width | Ambiguous |
| Uppercase | Yes |
| Other Uppercase | Yes |
| Simple Lowercase Code Point | "ⅰ" U+2170 Small Roman Numeral One |
| Lowercase Code Point | "ⅰ" U+2170 Small Roman Numeral One |
| Simple Case Folding | "ⅰ" U+2170 Small Roman Numeral One |
| Case Folding | "ⅰ" U+2170 Small Roman Numeral One |
| 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 |
| NFKC Simple Casefold | "i" U+0069 Latin Small Letter I |
| 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 |