Question

what is the symbol used for intersection​

Answer 1

2229 ∩

Intersection is denoted by the U+2229 ∩ INTERSECTION from Unicode Mathematical Operators. The symbol U+2229 ∩ was first used by Hermann Grassmann in Die Ausdehnungslehre von 1844 as general operation symbol, not specialized for intersection.

Answer 2

Respuesta:

The intersection operation is denoted by the symbol ∩. The set A ∩ B—read “A intersection B” or “the intersection of A and B”—is defined as the set composed of all elements that belong to both A and B.