| Symbol | Symbol Name | Meaning |
|---|---|---|
| { } | Set | A collection of elements |
| A ∪ B | Union | Elements that belong to set A or set B |
| A ∩ B | Intersection | Elements that belong to both the sets, A and B |
| A ⊆ B | Subset | All elements of A are contained in B |
| A ⊄ B | Not Subset | A is not a subset of B |
| A ⊂ B | Proper Subset | All elements of A are contained in B and A B |
| Empty Set | |
| | power set | all subsets of C |
| A = B | equality | both sets have the same members |
| A / B | relative complement, or difference | objects that belong to A and not to B |
| A ⊕ B | Symetric difference | elements that do not belong to both sets |
| | Complement | all the objects that do not belong to set A |
| a ∈ B | element of | set membership |
| x ∉ A | not element of | no set membership |
| A × B | cartesian product | set of all ordered pairs from A and B |
| | positive integer numbers set | positive integers |
| | natural numbers | N1 = {0, 1, 2, 3, 4, 5,…} |
| | integer numbers set | integers |
| | rational numbers set | non repeating decimal and integers |
| | real numbers set | all rational and irrational nubmers |
| | Universal set | a set of all possible values |