What does pk mean in belt size for cars?

In the context of belt sizes for cars, "pk" refers to the profile of the belt, specifically indicating a narrow, wedge-shaped design. The "p" stands for "poly-V" or "profile," while "k" denotes the width and height of the belt's cross-section, which is typically measured in millimeters. This designation helps ensure the correct fit and function of the belt within the vehicle's pulley system.