Truss

A truss is a structure that has beams, called members, across a structure such as a building or bridge to give it more support.

Types
There are two basic types of truss:
 The pitched truss, or common truss, uses triangular shaped bases. It is most often used for roof construction. 
 The parallel chord truss, or flat truss, gets its name from its parallel top and bottom chords. It is often used for floor construction.

References

Category:Architectural elements