The intersection (overlap) of A and B
The union of A and B (everything in both)
Complement of A (not A, everything outside of A)
The universal set (the set of everything)
a is an element of A (is in the set A)
A is a subset of B (every element in A is also in B) - (e.g A= 2, 4, 6, 8 B = 2, 4, 6, 8)
A is a proper subset of B (every element of A is also in B, but A and B are not identical) - (e.g A = 2, 4 B = 2, 4, 6, 8)
An empty set with no elements
n = the number of elements in set A