U+2290 "⊐" Square Original Of Unicode Character

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.