U+1D7D2 "𝟒" Mathematical Bold Digit Four Unicode Character
Unicode Version 17.0
𝟒
U+1D7D2 "𝟒" Mathematical Bold Digit Four is a specific typographical variant of the digit four, designed in a bold typeface for use in mathematical and scientific notation. It belongs to the Unicode block known as Mathematical Alphanumeric Symbols, which was added to the standard to allow distinct formatting for variables, constants, and numbers without relying on font styling markup. This character is intended to visually distinguish the digit in equations, matrices, or other technical contexts where weight or emphasis is needed, ensuring clarity and consistency across different text processing systems.
General Properties
| Code Point | U+1D7D2 |
| Version Added | 3.1 |
| Name | Mathematical Bold Digit Four |
| Block | Mathematical Alphanumeric Symbols |
| General Category | Decimal Number |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | European Number |
| Decomposition Type | Font |
| Decomposition Mapping | "4" U+0034 Digit Four |
Encodings
| HTML Decimal Encoding | 𝟒 |
| HTML Hex Encoding | 𝟒 |
| UTF-8 Encoding | 0xF0 0x9D 0x9F 0x92 |
| UTF-16 Encoding | 0xD835 0xDFD2 |
| UTF-32 Encoding | 0x0001D7D2 |
| C/C++/Java Escape | \ud835\udfd2 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | Decimal |
| Numeric Value | 4 |
| Line Break | Numeric |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "4" U+0034 Digit Four |
| NFKC Simple Casefold | "4" U+0034 Digit Four |
| 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 |