What do you call the feature that defines the radius of curvature of an edge within a design?

The radius of curvature of an edge in a design is specified by a fillet. A fillet is a geometric feature used in design modeling to create a smooth transition between two intersecting surfaces or edges. This feature helps to eliminate sharp corners, providing a more aesthetically pleasing appearance and enhancing the strength and durability of the component, as it reduces stress concentrations that can occur at sharp edges.

In contrast, other options like drawing border and drawing notes refer to elements used in documentation and layout but do not apply to the physical characteristics of edges in the design process. The term "feature" is too broad and does not specifically indicate the process of defining the radius of curvature. Thus, the term "fillet" accurately captures the intent and functionality of the curvature in design.