| Name | MATHEMATICAL BOLD DIGIT NINE |
| Unicode Version | 3.1 |
| Block（ブロック） | Mathematical Alphanumeric Symbols（数学用英数字記号） |
| Plane（面） | Supplementary Multilingual Plane（基本多言語面） |
| Script | |
| Category | |
| Bidirectional Class | |
| Combining Class | |
| Character is Mirrored | |
| HTML Entity | 𝟗 𝟗 |
| UTF-8 Encoding | 𝟗 f09d9f97 |
| UTF-16 Encoding | 𝟗 d835dfd7 |
| UTF-32 Encoding | 𝟗 0001d7d7 |