A hollow, tube-shaped body.
Within the realm of geometric forms, there exists an intriguing device—a cylindrical object that occasionally assumes the role of a cone. This cylindrical shape, when equipped with the ability to elongate, is referred to as an extension cylinder. Such a versatile apparatus serves various purposes, offering flexibility and adaptability in its applications. By utilizing the unique properties of this cylindrical shape, engineers and designers can explore alternative solutions and harness its potential in diverse scenarios.