U+29A1 "⦡" Spherical Angle Opening Up Unicode Character
Unicode Version 17.0
⦡
U+29A1 "⦡" Spherical Angle Opening Up is a typographic symbol belonging to the Supplemental Mathematical Operators block, designed to represent a spherical angle that opens in an upward direction. It is typically used in geometry, trigonometry, and related fields to denote a three dimensional angle formed by the intersection of three or more great circles on a sphere, with its opening oriented toward the top of the page. This character provides a clear, standardized way to express such mathematical concepts in electronic text, avoiding the need for custom graphics or ambiguous notation.
General Properties
| Code Point | U+29A1 |
| Version Added | 3.2 |
| Name | Spherical Angle Opening Up |
| Block | Miscellaneous Mathematical Symbols-B |
| General Category | Math Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Other Neutral |
Encodings
| HTML Decimal Encoding | ⦡ |
| HTML Hex Encoding | ⦡ |
| UTF-8 Encoding | 0xE2 0xA6 0xA1 |
| UTF-16 Encoding | 0x29A1 |
| UTF-32 Encoding | 0x000029A1 |
| C/C++/Java Escape | \u29a1 |
Unicode Properties
| NFC Quick Check | Yes |
| NFD Quick Check | Yes |
| NFKC Quick Check | Yes |
| NFKD Quick Check | Yes |
| Numeric Type | None |
| Numeric Value | NaN |
| Line Break | Alphabetic |
| Script | Common |
| Script Extensions | Common |
| Indic Syllabic Category | Other |
| Pattern Syntax | Yes |
| Math | Yes |
| Vertical Orientation | Rotated |
| Grapheme Base | Yes |
| Grapheme Cluster Break | Other |
| Word Break | Other |
| Sentence Break | Other |