A relational symbol indicating that one set contains or equals another set in set theory.
Examples
Basic set containment
\{1, 2, 3, 4\} \supseteq \{1, 3\}
Number set relationship
\mathbb{R} \supseteq \mathbb{Q} \supseteq \mathbb{Z}
Set theory with variables
A \supseteq B \text{ means that } B \subseteq A