Answer: subset
A ⊆ B
Explanation:
Set A is a subset of set B, If and only if all the elements of set A are also elements of set B.
A subset is a set whose elements are all members of another set. The symbol "⊆" means "is a subset of". For example:
Set A: {1,2,3}
Set B: {0,1,2,3,4,7,8,}
Since all the elements of set A (1,2,3) are in set B. So
A⊆B.