U+1D7D7 "𝟗" Mathematical Bold Digit Nine Unicode Character
Unicode Version 17.0
𝟗
U+1D7D7 "𝟗" Mathematical Bold Digit Nine is a typographic variant of the standard digit nine, designed specifically for use in mathematical and scientific notation where a bold typeface is required to distinguish numbers from surrounding text or to denote vectors, matrices, or other special values. This character belongs to the Mathematical Alphanumeric Symbols block, which provides dedicated glyphs that allow mathematicians and scientists to unambiguously represent mathematical expressions in digital text without relying on formatting workarounds like font styling. Its solid, heavier appearance ensures clear legibility in equations, particularly when used alongside other bold mathematical symbols.
General Properties
| Code Point | U+1D7D7 |
| Version Added | 3.1 |
| Name | Mathematical Bold Digit Nine |
| Block | Mathematical Alphanumeric Symbols |
| General Category | Decimal Number |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | European Number |
| Decomposition Type | Font |
| Decomposition Mapping | "9" U+0039 Digit Nine |
Encodings
| HTML Decimal Encoding | 𝟗 |
| HTML Hex Encoding | 𝟗 |
| UTF-8 Encoding | 0xF0 0x9D 0x9F 0x97 |
| UTF-16 Encoding | 0xD835 0xDFD7 |
| UTF-32 Encoding | 0x0001D7D7 |
| C/C++/Java Escape | \ud835\udfd7 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | Decimal |
| Numeric Value | 9 |
| Line Break | Numeric |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "9" U+0039 Digit Nine |
| NFKC Simple Casefold | "9" U+0039 Digit Nine |
| 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 |