\nsubseteqqThe symbol \nsubseteqq is used in mathematical notation to denote that a set is not a subset of another set, with an emphasis on the equality aspect. It is a negated version of the subset relation with equality, indicating that the first set is neither a subset nor equal to the second set.
Set A is not a subset of set B, nor is it equal to set B.
A \nsubseteqq BThe set \{1, 2, 3\} is not a subset of \{1, 2, 3, 4\} when considering equality, as it is not equal to the larger set.
\{1, 2, 3\} \nsubseteqq \{1, 2, 3, 4\}General notation indicating that set X is not a subset of set Y, nor is it equal to set Y.
X \nsubseteqq Y