To any set that contains it!
It belongs to {-6},
or {45, sqrt(2), -6, pi, -3/7},
or all whole numbers between -43 and 53,
or multiples of 3,
or integers,
or rational numbers,
or real numbers,
or complex numbers,
etc.
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1.18 is a number and number do not contain any sets (of any kind).
The overlapping sections show elements that belong to each of the two (or maybe three) sets that overlap there.The overlapping sections show elements that belong to each of the two (or maybe three) sets that overlap there.The overlapping sections show elements that belong to each of the two (or maybe three) sets that overlap there.The overlapping sections show elements that belong to each of the two (or maybe three) sets that overlap there.
The difference of two sets A and B , to be denoted by A-B, is the set of all those elements which belong to A but not to B
Elements can belong to subsets. Subsets can be elements of sets that are called "power sets".
The intersection of two sets S and T is the set of all elements that belong to both S and T.