U+1D401 "𝐁" Mathematical Bold Capital B Unicode Character
Unicode Version 17.0
𝐁
U+1D401 "𝐁" Mathematical Bold Capital B is part of the Mathematical Alphanumeric Symbols block, specifically designed to represent a bold uppercase Latin B for use in mathematical and scientific notation. It is encoded at code point U+1D401 in Unicode version 3.1, released in March 2001, and serves to distinguish styled text from plain Latin letters, supporting clarity in equations, vector notation, and mathematical expressions. This character is distinct from the regular ASCII capital B, ensuring that typographic formatting is preserved in digital text without relying on font-based bolding.
General Properties
| Code Point | U+1D401 |
| Version Added | 3.1 |
| Name | Mathematical Bold Capital B |
| Block | Mathematical Alphanumeric Symbols |
| General Category | Uppercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Font |
| Decomposition Mapping | "B" U+0042 Latin Capital Letter B |
Encodings
| HTML Decimal Encoding | 𝐁 |
| HTML Hex Encoding | 𝐁 |
| UTF-8 Encoding | 0xF0 0x9D 0x90 0x81 |
| UTF-16 Encoding | 0xD835 0xDC01 |
| UTF-32 Encoding | 0x0001D401 |
| C/C++/Java Escape | \ud835\udc01 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Uppercase | Yes |
| Cased | Yes |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "b" U+0062 Latin Small Letter B |
| NFKC Simple Casefold | "b" U+0062 Latin Small Letter B |
| Script | Common |
| Script Extensions | Common |
| Indic Syllabic Category | Other |
| ID Start | Yes |
| XID Start | Yes |
| ID Continue | Yes |
| XID Continue | Yes |
| Alphabetic | Yes |
| Math | Yes |
| Other Math | Yes |
| Vertical Orientation | Rotated |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Alphabetic letter |
| Sentence Break | Upper |