Final answer:
The device used to conduct an orchestra is called a baton, which is a stick that conductors use to lead and direct musicians during a performance.
Explanation:
The name of the device used to conduct an orchestra is a baton. A baton is a stick that a conductor holds and uses to lead and direct musicians during a performance. By waving the baton, the conductor indicates the tempo, dynamics, and other musical elements to the orchestra.
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