You may refer to a truss as the rafter, but it's basically the skeleton of the roof, carrying the weight of the frame and supporting the walls of the building. Trusses are very important to preventing the walls from bending or flexing, more so.
16 Easy and Stylish DIY Floating Shelves & Wall Shelves - A Piece Of Rainbow 16 easy tutorials on building beautiful floating shelves and wall shelves! Check out all the gorgeous brackets, supports, finishes & design inspirations! - A Piece Of Rainbow