U+1D44B "𝑋" Mathematical Italic Capital X Unicode Character
Unicode Version 17.0
𝑋
U+1D44B "𝑋" Mathematical Italic Capital X is a typographic variant of the standard uppercase X, designed primarily for use in mathematical and scientific notation to represent variables or constants in italicized expression. It belongs to the Mathematical Alphanumeric Symbols block, which was introduced to distinguish mathematical letters from ordinary text for improved clarity in digital document processing. This specific character is often employed in algebra, calculus, and physics to denote unknown values, axes, or functions, and its italic style follows the traditional convention of slanted type for variables in typesetting.
General Properties
| Code Point | U+1D44B |
| Version Added | 3.1 |
| Name | Mathematical Italic Capital X |
| Block | Mathematical Alphanumeric Symbols |
| General Category | Uppercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Font |
| Decomposition Mapping | "X" U+0058 Latin Capital Letter X |
Encodings
| HTML Decimal Encoding | 𝑋 |
| HTML Hex Encoding | 𝑋 |
| UTF-8 Encoding | 0xF0 0x9D 0x91 0x8B |
| UTF-16 Encoding | 0xD835 0xDC4B |
| UTF-32 Encoding | 0x0001D44B |
| C/C++/Java Escape | \ud835\udc4b |
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 | "x" U+0078 Latin Small Letter X |
| NFKC Simple Casefold | "x" U+0078 Latin Small Letter X |
| 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 |