Mathematical Symbols - NOT Subset
the D set is not the subset of the set S
This symbol is valid if one of the following criteria applies:
(1) . . . Both Set "D" and Set "S" have NOTHING IN COMMON. Each set contains completely different elements.
(2) . . . All of the elements in Set “D” do not appear in Set “S”. Set “D” contains some of the elements in set “S”, but Set “D” also contains other elements which do not appear in Set “S”.