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...
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Scissor Truss | Trusses King Post Trusses Scissor Trusses Hammer Beams Tie Rod Trusses ...
Skandia Truss - Room In Attic
Exposed trusses are a feature of the living areas.
Giant scissor trust beams with iron plate
Image detail for -... Design Products :: EXPOSED ROOF TRUSSES AND ROOF CONSTRUCTION :: 4_5
http://pacificpostbeam.com/trusses/truss-gallery/ scissor truss