" or "coin
" refers to a slightly projecting, sometimes rough-finished masonry
on the corners of buildings
. Architects and builders use quoins
to give the impression of strength and firmness to the outline of a building. Rough-finished or rusticated masonry is also frequently used for foundation
layers of buildings to give the same impression. Quoinage can be carried out in stone on a stone building, with stone on a predominantly brick
building, or by laying brick masonry to give the appearance of blocks at the corner.