\nsupseteqqThe symbol \nsupseteqq is used to denote that a set is not a superset of another set, with an emphasis on the equality aspect. It is a negated relation symbol in set theory.
Set A is not a superset of set B, including the possibility of being equal.
A \nsupseteqq BThe set \{1, 2, 3\} is not a superset of \{1, 2, 3, 4\}.
\{1, 2, 3\} \nsupseteqq \{1, 2, 3, 4\}General expression indicating set X is not a superset of set Y.
X \nsupseteqq Y