| Symbol | Reading / Meaning |
|---|---|
| \(\subset\) | Proper subset, contains, is contained in |
| \(\supset\) | Contains as a proper subset |
| \(\cup\) | Or, union, union set |
| \(\cap\) | And, intersection, intersection set |
| \(\in\) | Belongs to, is an element of |
| \(\ni\) | Contains as an element |