Definition of toping:
(n) :
The highest or uppermost part of something.
(n) :
(irrespective of present orientation) The part of something that is usually highest or uppermost.
(n) :
The uppermost part of a page, picture, viewing screen, etc.
(n) :
A lid, cap, or cover of a container.
(n) :
A garment worn to cover the torso.
(n) :
A framework at the top of a ship's mast to which rigging is attached.