U+1D4D8 "𝓘" Mathematical Bold Script Capital I Unicode Character
Unicode Version 17.0
𝓘
U+1D4D8 "𝓘" Mathematical Bold Script Capital I is a specifically encoded glyph designed for use in mathematical and scientific notation, representing the capital letter I in a bold, script typeface. This character belongs to the Mathematical Alphanumeric Symbols block, a set created to distinguish textual letters from those used as mathematical variables, thereby preventing ambiguity in formal documents. In practice, it is most commonly employed to denote sets, such as the identity matrix in linear algebra, or to represent the imaginary unit in complex number contexts when a clear, stylized symbol is preferred.
General Properties
| Code Point | U+1D4D8 |
| Version Added | 3.1 |
| Name | Mathematical Bold Script Capital I |
| Block | Mathematical Alphanumeric Symbols |
| General Category | Uppercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Font |
| Decomposition Mapping | "I" U+0049 Latin Capital Letter I |
Encodings
| HTML Decimal Encoding | 𝓘 |
| HTML Hex Encoding | 𝓘 |
| UTF-8 Encoding | 0xF0 0x9D 0x93 0x98 |
| UTF-16 Encoding | 0xD835 0xDCD8 |
| UTF-32 Encoding | 0x0001D4D8 |
| C/C++/Java Escape | \ud835\udcd8 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Uppercase | Yes |
| Cased | 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 | Common |
| Script Extensions | Common |
| Indic Syllabic Category | Other |
| ID Start | Yes |
| XID Start | Yes |
| ID Continue | Yes |
| XID Continue | Yes |
| Alphabetic | Yes |
| Math | Yes |
| Other Math | Yes |
| Vertical Orientation | Rotated |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Alphabetic letter |
| Sentence Break | Upper |