Which of the following options is not classified as a line in engineering drawings?

In engineering drawings, lines serve various purposes, such as indicating outlines, features, and dimensions of objects. The classifications of lines, such as section, hidden, and center lines, each have specific roles in providing clarity and understanding of the drawing.

Finish lines are not typically classified in the same way as the other types of lines mentioned. Finish lines generally refer to the surface finish of a part rather than a specific line type used in drafting. They do not communicate a specific geometric or significant feature within the context of engineering drawings.

In contrast, section lines indicate where a cut has been made through an object in a sectional view, hidden lines represent features that are not visible from the current view due to being obscured by other parts, and center lines show the center of circles or symmetrical parts. Each of these lines provides important information about the design and should be utilized appropriately to convey the necessary details within engineering graphics.