Sector - A sector is basically a room made up of vertices, edges, and surfaces.
Surface - A surface is one side of a sector, a flat shape (like a wall of a room), made up of vertices and edges.
Edge - An edge is where two surfaces meet and is represented by a line drawn between two vertices.
Vertex - A vertex is a single point, like a period on this page, that connects edges and makes angles possible.
Objects in red are defined below each image.
 Sector |
 Surface |
 Vertex |
 Edge |