⊔

See also: ⨆ [U+2A06 N-ARY SQUARE UNION OPERATOR], ∐ [U+2210 N-ARY COPRODUCT], and ⨿ [U+2A3F AMALGAMATION OR COPRODUCT]

⊔ U+2294, ⊔ SQUARE CUP ← ⊓ [U+2293] Mathematical Operators ⊕ → [U+2295]

Translingual

Symbol

⊔

1. (mathematics) disjoint union
2. (computer science) blank symbol, used in Turing machine diagrams

Coordinate terms

• ⊓, ∏, ∐, ⨿