U+2290 "⊐" Square Original Of Unicode Character
Unicode Version 17.0
⊐
U+2290 "⊐" Square Original Of is a mathematical symbol from the Unicode block for Miscellaneous Mathematical Symbols-A, representing a square that denotes the original of an operation or transformation in areas like algebra and logic. It is the rightward-facing counterpart to the more common "⊏" (Square Image Of) and is often used in lattice theory, order theory, or category theory to indicate a subset, subobject, or a relation where one element is an original of another, typically placed between two mathematical expressions. Visually, it resembles a hollow square with an open right side, and it is encoded specifically for technical and academic texts that require precise notation for structural mappings or derivations.
General Properties
| Code Point | U+2290 |
| Version Added | 1.1 |
| Name | Square Original Of |
| Block | Mathematical Operators |
| General Category | Math Symbol |
| Canonical Combining Class | Not Reordered |
| Bidirectional Class | Other Neutral |
| Mirrored | Yes |
| Mirrored Character | "⊏" U+228F Square Image Of |
Encodings
| HTML Decimal Encoding | ⊐ |
| HTML Hex Encoding | ⊐ |
| UTF-8 Encoding | 0xE2 0x8A 0x90 |
| UTF-16 Encoding | 0x2290 |
| UTF-32 Encoding | 0x00002290 |
| C/C++/Java Escape | \u2290 |
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 |