Symbols
1. 
(Belongs to)
2. 
(Does not belongs to)
3. :or (Such that)
4. < (Less than)
5. > (Greater than)
6. 
(And)
7. V (or)
8. 
(For every or For all)
9. 
(Implies that)
10. 
(Is implied by)
11. 
(If and only if) or (Implies and is implied by)
12. 
(Is a subset of)
13. 
(Is not a subset of)
14. 
(Is a super set of or Is contains)
15. 
(Is a proper subset of or Is contained in)
16. ⊄ (Is not a proper subset of or, Is not contained in)
17. 
(There exist)
18. 
(Union of sets)
19. 
(Intersection of sets)
20. U (universal set )
21. 
Congruent