U+1D7D1 "π" Mathematical Bold Digit Three Unicode Character
Unicode Version 17.0
π
U+1D7D1 "π" Mathematical Bold Digit Three is a typographic variant of the standard digit three, designed specifically for use in mathematical and scientific notations where a bold weight helps distinguish numbers from surrounding variables or regular text. It belongs to the "Mathematical Alphanumeric Symbols" block, which provides a comprehensive set of styled letters and digits for precise formatting in equations. This character ensures that the digit three appears with a heavier, more prominent stroke, making it suitable for contexts like matrices, vectors, or bold-numbered sequences without relying on textβlevel font formatting that might not transfer reliably across different platforms.
General Properties
| Code Point | U+1D7D1 |
| Version Added | 3.1 |
| Name | Mathematical Bold Digit Three |
| Block | Mathematical Alphanumeric Symbols |
| General Category | Decimal Number |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | European Number |
| Decomposition Type | Font |
| Decomposition Mapping | "3" U+0033 Digit Three |
Encodings
| HTML Decimal Encoding | 𝟑 |
| HTML Hex Encoding | 𝟑 |
| UTF-8 Encoding | 0xF0 0x9D 0x9F 0x91 |
| UTF-16 Encoding | 0xD835 0xDFD1 |
| UTF-32 Encoding | 0x0001D7D1 |
| C/C++/Java Escape | \ud835\udfd1 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | Decimal |
| Numeric Value | 3 |
| Line Break | Numeric |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "3" U+0033 Digit Three |
| NFKC Simple Casefold | "3" U+0033 Digit Three |
| 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 |