U+22D1 "⋑" Double Superset Unicode Character
Unicode Version 17.0
⋑
U+22D1 "⋑" Double Superset is a mathematical symbol that represents a double superset relationship, typically used in set theory and formal logic to indicate that one set is a superset of another, sometimes with additional connotations of strictness or explicit double containment. It resembles two nested, large square brackets or angle brackets opening outward, and while it is less commonly used than the standard single superset symbol (⊃), it can appear in specialized notations for defining relational structures or in contexts where a more emphatic or distinct symbol is needed to avoid ambiguity with similar characters.
General Properties
| Code Point | U+22D1 |
| Version Added | 1.1 |
| Name | Double Superset |
| Block | Mathematical Operators |
| General Category | Math Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Other Neutral |
| Mirrored | Yes |
| Mirrored Character | "⋐" U+22D0 Double Subset |
Encodings
| HTML Decimal Encoding | ⋑ |
| HTML Hex Encoding | ⋑ |
| UTF-8 Encoding | 0xE2 0x8B 0x91 |
| UTF-16 Encoding | 0x22D1 |
| UTF-32 Encoding | 0x000022D1 |
| C/C++/Java Escape | \u22d1 |
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 |