Final answer:
A masonry unit designed for finishing a course or bonding a corner of a wall is known as a quoin, which is not listed among the given options. The provided options are types of bricks used in different patterns and functions within masonry work.
Step-by-step explanation:
A masonry unit that is specially formed or cut to finish a course or complete the bond at the corner of a wall is known as a quoin or corner block. None of the options provided directly refer to this specific element. However, these options do represent different types of blocks or bricks commonly used in masonry:
- Closer - A piece of brick cut to a particular size to complete a brick bond pattern.
- Stretcher - A brick laid flat with its long face parallel to the wall, mainly used to cover space in a wall.
- Header - A brick laid flat with its width at the face of the wall, used to bond with the perpendicular bricks.
- Soldier - A brick laid vertically with its long, narrow side exposed, often for decorative purposes in a wall.
When considering ashlar masonry, a process of stone construction where stones are meticulously cut and assembled to form a tight-fitting rectilinear grid with minimal or no mortar, the term quoin is relevant as these are the cornerstones that provide strength and support for masonry walls.