\varsubsetneqqThe symbol \varsubsetneqq is used in mathematics to denote a subset that is not equal to the set it is compared with. It is a negated relation indicating that one set is a proper subset of another, meaning all elements of the first set are in the second set, but the second set contains additional elements not found in the first.
Set A is a proper subset of set B, meaning A is contained within B but is not equal to B.
A \varsubsetneqq BThe set {1, 2} is a proper subset of the set {1, 2, 3}.
\{1, 2\} \varsubsetneqq \{1, 2, 3\}Set X is a proper subset of set Y, indicating X is entirely contained within Y but Y has additional elements.
X \varsubsetneqq Y