U+27C3 "⟃" Open Subset Unicode Character

U+27C3 "⟃" Open Subset is a mathematical symbol that visually represents a subset symbol with an opening, as if the left side of a standard subset sign (⊂) is not fully closed, indicating a specialized or altered relation between sets. It belongs to the Miscellaneous Mathematical Symbols-A block and is typically used in advanced set theory or lattice theory contexts to denote a variation of the subset relation, such as an open subset in a topological space or a non-strict inclusion where the boundary is omitted. Unlike the more common subset symbols U+2282 (⊂) or U+2286 (⊆), this glyph emphasizes a specific property of openness or incompleteness in the containment relationship.