I am not an expert in the are of BPMN. I have a question. 

Does BPMN support the idea of "Milestone". While milestones are one of the major concepts in the Business processes or for any Institutional projects. 

If yes is the answer, Please let me know how.

If no, what would be the reason or logic behind not including it.

Sorry if my question doesnt make sense!

Thanks in advance.

Regards

Karthik