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vertices is an an option for voronoiFormat (an option for voronoiDiagram) and convexHullFormat (an option for convexHull).

In convexHull, if

	convexHullFormat→{..
	                  vertices→True,
	                  ..}

then part of the object returned by convexHull includes a list of vertex indices

	{..,
	 vertices→{i1,i2,...}
	 ..}

These indices represent the complex hull; they are indices of the point set input ot convexHull.

In voronoiDiagram, if

	voronoiFormat→{..
	             vertices→True
	             ..}

then part of the object returned by voronoiDiagram is a list of coordinates giving the vertices of the Voronoi Diagram:

	{..
	vertexCoordinates->{{x1,y1,..},{x2,y2,...},...} 
	..}