a horizontal platform in the shape of a circular disk

A horizontal platform in the shape of a circular disk is commonly known as a "disc" or "disk." It is a flat, round surface with a circular shape that is often used as a base for objects or as a tool in various applications.

Discs can be made of a variety of materials, including metal, plastic, or wood, and can vary in size and thickness depending on their intended use. They are often used as a support for objects, such as a turntable for playing records or a platform for a statue or plant.

In addition to their practical applications, discs are also used in sports, such as disc golf, and in various forms of entertainment, such as frisbee throwing or spinning tops. The circular shape of a disc allows it to spin easily, making it useful in many different contexts.