In North America, which of the following is the third orthographic view commonly used?

In orthographic projection, three primary views are commonly used to represent a three-dimensional object in two dimensions: the front view, the top view, and the side view. The front view provides a clear depiction of the height and width of an object, while the top view helps visualize its depth and width. The side view, often referred to as the right view, presents features visible from the side perspective.

In the context of this question, the term "third orthographic view" is typically acknowledging that after the front and top views, the left-view perspective is indeed often regarded as the third standard view in North American practices. It completes the representation of the object by providing additional insight into its dimensions and features from an alternative angle, which can be crucial for fabrication, assembly, or engineering processes.

The emphasis on the left view as the third view highlights its importance in ensuring a comprehensive understanding of the object being described, enabling other professionals, such as engineers and fabricators, to accurately interpret the design intent.