Final answer:
A cantilever is a supporting member that projects into space and is supported at only one end, used in various engineering applications such as bridges and buildings.
Step-by-step explanation:
A supporting member that projects into space and is supported at only one end is known as a cantilever. In engineering, cantilevers are used in various structures, such as bridges, buildings, and even furniture. These structures rely on the principle of cantilever action, where the supporting force is applied from one side, allowing the beam or structure to extend out into space without additional support at its far end.
Cantilevers are beneficial in situations where it's impractical or impossible to have supports on both ends of the structure. An example of a cantilever in use can be seen in the design of a cantilever bridge, where a section of the bridge extends out past the supporting pier without any intermediate supports, thereby forming a clear span that is useful for navigating obstacles such as bodies of water or roadways.