Name of the set which contains all elements is UNIVERSAL SET. It is usually represented by (U)
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The cardinal number of a set is the number of elements in the set. Example: the cardinal number of the set {6, prune, 675, biscuit, London} is 5, since the set contains five elements. If a set contains repeated elements, they should only be counted once. Example: the cardinal number of the set {6, 7, 3, 4, 4, 7} is 4 (not 6) since the fours and sevens are only counted once.
That is called the set of "integers".
If all elements of set A are also elements of set B, then set A is a subset of set B.
That is called the UNION of the two sets.
Any one of the numbers is equal to the mean of the set.