What is the term for long pipes or poles from which curtains, lights, or flats are hung?

The term for long pipes or poles from which curtains, lights, or flats are hung is "batten." Battens are essential elements in stage design and rigging, providing a support structure that allows for the suspension of various theatrical components, such as backdrops, lighting fixtures, and other scenic devices. These rods or pipes can be adjustable in height and are often used in combination with pulleys and other rigging systems to facilitate easy adjustments during performances.

In theatrical settings, battens are critical for creating the desired staging environment and ensuring that various elements can be positioned appropriately to enhance the visual and practical aspects of a production. Their versatility allows for changes in scenery and lighting without the need for extensive reconfiguration of the stage space.