\supseteqqThe symbol \supseteqq is used in mathematical notation to denote that one set is a superset of another set, including the possibility of being equal. It is a relation symbol that indicates that every element of the second set is also an element of the first set, and possibly both sets are identical.
Set A is a superset of set B, possibly equal.
A \supseteqq BThe set \{1, 2, 3\} is a superset of \{2, 3\}.
\{1, 2, 3\} \supseteqq \{2, 3\}Any set X is a superset of the empty set.
X \supseteqq \emptyset