U+1D7D8 "𝟘" Mathematical Double-Struck Digit Zero Unicode Character
Unicode Version 17.0
𝟘
U+1D7D8 "𝟘" Mathematical Double-Struck Digit Zero is a stylized version of the digit zero featuring double struck or blackboard bold lettering, a typographic convention often used in mathematical and scientific notation to represent number sets or to add visual distinction in equations. This character belongs to the "Mathematical Alphanumeric Symbols" block in Unicode and is typically rendered with a bold, hollow outline, making it stand out from standard text. It is commonly employed in contexts like set theory or linear algebra to denote the zero vector, the zero matrix, or the concept of zero within a specific mathematical structure, ensuring clarity and precision in written mathematics.
General Properties
| Code Point | U+1D7D8 |
| Version Added | 3.1 |
| Name | Mathematical Double-Struck Digit Zero |
| Block | Mathematical Alphanumeric Symbols |
| General Category | Decimal Number |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | European Number |
| Decomposition Type | Font |
| Decomposition Mapping | "0" U+0030 Digit Zero |
Encodings
| HTML Decimal Encoding | 𝟘 |
| HTML Hex Encoding | 𝟘 |
| UTF-8 Encoding | 0xF0 0x9D 0x9F 0x98 |
| UTF-16 Encoding | 0xD835 0xDFD8 |
| UTF-32 Encoding | 0x0001D7D8 |
| C/C++/Java Escape | \ud835\udfd8 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | Decimal |
| Numeric Value | 0 |
| Line Break | Numeric |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "0" U+0030 Digit Zero |
| NFKC Simple Casefold | "0" U+0030 Digit Zero |
| 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 |