Coping is a structure which is constructed on top of Wing-walls, Return-walls, Boundary walls & parapet wall etc. to protect the masonry.
The main purpose of providing coping is to drain off the rain water during rainy season & improves aesthetics of the structure/wall.
It made on the top and it carry the slope 1:20 from the center in both side. Coping is provided by laying lean concrete and also reinforcement is needed it should mainly take care of crack in the parapet wall. Stones and different kind of tiles are also used for this purpose.
It is also provides at any level of high raise buildings for good look now a days some buildings gives architectural view through the coping only.