U+1D7CF "𝟏" Mathematical Bold Digit One Unicode Character
Unicode Version 17.0
𝟏
U+1D7CF "𝟏" Mathematical Bold Digit One is a stylized numeral belonging to the Mathematical Alphanumeric Symbols block, designed for use in technical and mathematical contexts where a bold typeface is required to distinguish it from standard text. Unlike the regular digit "1", which may be used in general writing, this character is primarily employed in mathematical notation, equations, and scientific documents to denote numeric values with a clear, weighty appearance that aligns with bold variables or other symbolic elements. It helps maintain typographic consistency in complex expressions, ensuring that numerals stand out when used alongside bold operators, vectors, or matrices without relying on manual formatting.
General Properties
| Code Point | U+1D7CF |
| Version Added | 3.1 |
| Name | Mathematical Bold Digit One |
| Block | Mathematical Alphanumeric Symbols |
| General Category | Decimal Number |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | European Number |
| Decomposition Type | Font |
| Decomposition Mapping | "1" U+0031 Digit One |
Encodings
| HTML Decimal Encoding | 𝟏 |
| HTML Hex Encoding | 𝟏 |
| UTF-8 Encoding | 0xF0 0x9D 0x9F 0x8F |
| UTF-16 Encoding | 0xD835 0xDFCF |
| UTF-32 Encoding | 0x0001D7CF |
| C/C++/Java Escape | \ud835\udfcf |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | Decimal |
| Numeric Value | 1 |
| Line Break | Numeric |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "1" U+0031 Digit One |
| NFKC Simple Casefold | "1" U+0031 Digit One |
| Script | Common |
| Script Extensions | Common |
| Indic Syllabic Category | Other |
| ID Continue | Yes |
| XID Continue | Yes |
| Math | Yes |
| Other Math | Yes |
| Vertical Orientation | Rotated |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Numeric |
| Sentence Break | Numeric |