A strict superset relation symbol indicating one set properly contains another set, with strict inequality in set theory.
Examples
Strict superset relationship between number sets
\mathbb{R} \supsetneq \mathbb{Q}
Comparing infinite sets
\{x \in \mathbb{R} : x \geq 0\} \supsetneq \mathbb{N}
Finite set example
\{1, 2, 3, 4\} \supsetneq \{1, 2, 3\}