What is the term for a line that defines the edges of an object or shape?

The term that refers to a line defining the edges of an object or shape is known as a visible line. Visible lines are solid lines used in technical drawings to represent edges that are directly observable, helping to clarify the form and details of a given object. They serve as a primary means of communicating the boundaries and outlines of illustrated components in printreading.

Visible lines contrast with other line types, such as hidden lines and center lines, which serve different functions. Hidden lines indicate edges that are not visible from the current viewpoint, often represented by dashed lines, thus showing features that are obscured. Center lines are used to indicate axes of symmetry or the center of circles and are typically drawn with alternating long and short dashes. The understanding of visible lines is essential for accurately interpreting and creating precise technical drawings, especially in fields that require high levels of detail and specificity, such as architecture and engineering.