UML. What elements are used?

In UML (Unified Modeling Language), various elements are used for system modeling. The main types of elements:

• Classes (Class) — rectangles with a name, attributes, and methods, describing the structure of objects.
• Objects (Object) — instances of classes, usually denoted with an underscore before the name.
• Associations (Association) — lines between classes showing relationships.
• Aggregation and Composition — special types of associations indicating "part-whole" relationships.
• Interfaces (Interface) — define a set of methods without implementation.
• Activities (Activity) — actions in activity diagrams.
• States (State) — states of objects in state diagrams.
• Packages (Package) — group elements into logical blocks.
• Components (Component) — system modules.
• Nodes (Node) — physical devices or servers.

If you provide a specific diagram or description, I can help identify the elements used more precisely.