It is used in set theory to indicate intersection. The intersection of two sets, A and B, is the set of all elements that are in A as well as in B.
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In sets it means intersects. like what is common in both sets
Intersection. This is used in set theory to refer to those members of two sets which are common to both. e.g. the intersection of { p a n s y } and { p r i m u l a } is { p a } In a Venn diagram (a graphical representation of sets) it is the overlap of two shapes.
(the shape is an upside down 'u').
It would either be a big upside-down ' V ', or else a big upside-down ' U '. The distance from the starting point would start at zero, then it would grown and grow and grow for a while, then stop growing, and then it would shrink and shrink and shrink, until it was zero again.