What is DPI rate?

Excuse me, could you please clarify what the DPI rate stands for in the context of cryptocurrency and finance? I'm somewhat familiar with terms like ROI, APY, and other financial metrics, but DPI rate is a new one for me. Is it a specific measurement used to evaluate the performance of a digital asset or a particular investment strategy? Could you elaborate on its significance and how it's calculated? I'd appreciate any insights you could provide.