U+1D428 "𝐨" Mathematical Bold Small O Unicode Character
Unicode Version 17.0
𝐨
U+1D428 "𝐨" Mathematical Bold Small O is a typographic symbol that represents the lowercase letter 'o' in a bold typeface specifically designed for use in mathematical and scientific notation. It belongs to the Mathematical Alphanumeric Symbols block, which was added to the Unicode Standard to allow authors to clearly distinguish variables and constants from plain text in digital documents. This character is often used in equations, formulas, and academic writing where a bold style indicates a vector, a set, or a specific mathematical object, ensuring precision and readability in complex notation.
General Properties
| Code Point | U+1D428 |
| Version Added | 3.1 |
| Name | Mathematical Bold Small O |
| Block | Mathematical Alphanumeric Symbols |
| General Category | Lowercase Letter |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Left To Right |
| Decomposition Type | Font |
| Decomposition Mapping | "o" U+006F Latin Small Letter O |
Encodings
| HTML Decimal Encoding | 𝐨 |
| HTML Hex Encoding | 𝐨 |
| UTF-8 Encoding | 0xF0 0x9D 0x90 0xA8 |
| UTF-16 Encoding | 0xD835 0xDC28 |
| UTF-32 Encoding | 0x0001D428 |
| C/C++/Java Escape | \ud835\udc28 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Lowercase | Yes |
| Cased | Yes |
| Changes When NFKC Casefolded | Yes |
| NFKC Casefold | "o" U+006F Latin Small Letter O |
| NFKC Simple Casefold | "o" U+006F Latin Small Letter O |
| 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 | Lower |