What does the diamond mean in UML?

Related questions

1. What is interaction diagram and types of interaction diagram?
2. What is a UML diagram in Java?
3. What is the importance of modeling in UML?
4. What is an attribute in UML?
5. What are the types of relation?

Tags

1. #aggregation
2. #composition
3. #whilst
4. #refer
5. #another
6. #diamond
7. #black
8. #objects
9. #classes
10. #relationship
11. #indicates
12. #between
13. #showing
14. #relationships
15. #diamonds
16. #class
17. #diagram
18. #hollow