In
architecture and
masonry, the term
set-off is given to the horizontal line shown on a
floorplan indicating a reduced wall thickness, and consequently the part of the thicker portion appears projecting before the thinner. In
plinths, this is generally simply chamfered. In other parts of stonework, the set-off is generally concealed by a projecting stringer. Where, as in
parapets, the upper part projects (is "proud of") the lower, the break is generally hid by a corbel
watertable. The portions of buttress caps which recede one behind another are also called sets-off.