Explanations:
Spall– Chips of stones used to fill up the empty spaces in the stone masonry. Corbel– A projection putting out from a wall to support a structure above it. Cornice– It is a horizontal mounded projection provided near the top of a building. Quoins : The exterior angle or corner of a wall is known as quoin. The stones or bricks forming the quoins are known as stone quoins or quoins bricks.