What does DPR mean on a diesel truck?

Could you please clarify the meaning of the acronym "DPR" when it appears on a diesel truck? I'm curious to know if it stands for a specific model, engine type, or perhaps a feature that's unique to diesel-powered vehicles. Additionally, I'm interested in understanding if there's any industry standard or common practice associated with this acronym in the context of diesel trucks. Any insights or clarification you can provide would be greatly appreciated.