What is the term for the vertically aligned edge of a corner in masonry?

The term for the vertically aligned edge of a corner in masonry is known as the "corner of the lead." In masonry construction, a "lead" represents the first section or course of masonry that is built. The corner, therefore, refers specifically to the point where two faces of the masonry meet at a right angle, generally creating a vertical edge. This edge is crucial in ensuring that the masonry is symmetrical and structurally sound.

Understanding this term is vital for mason practitioners because accurately creating and maintaining these corners impacts the integrity of the entire structure. Proper corner formation also helps ensure that subsequent courses of masonry align correctly, which is essential for overall aesthetics and strength. In contrast, the other options do not accurately define this feature in masonry construction. For instance, while "block edge" and "vertical face" may describe parts of masonry, they do not specifically refer to the corner alignment, and "joint edge" typically pertains to the space between two masonry units rather than a corner feature.