If I'm correct in interpreting what you're asking, the intersection set is the set between two sets that contains the common elements (denoted by what looks almost like a large lowercase n). In other words, if:
set A = {1,2,3,7,8,9}
and set B = {2,3,6,8,9,10)
then the intersection set (A n B) = {2,3,8,9}.
Just take what the two sets have in common, and put them together (don't repeat the digits, just what's in common).
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The intersection of two sets S and T is the set of all elements that belong to both S and T.
Given two or more sets there is a set which is their union and a set which is there intersection. But, there is no such thing as a "union intersection set", as required for the answer to the question.
Crossing, the same meaning that it has generally.
is the result after doing intersection on 2 or more sets. It contains the elements which are common to all the sets on which intersection were done.
If B = {10111213} and C = {1213} then their intersection is the empty set, {}.The union of A with an empty set is set A.