A "ball-type" refers to a category of objects or mechanisms that are spherical or rounded in shape. This design allows for smooth movement and rotation, making them useful in various applications, such as sports, toys, and machinery. Examples include soccer balls, basketballs, and bearing balls. In sports, ball-type objects are often used to facilitate gameplay, where players aim to score points or goals. The spherical shape ensures that they can roll or bounce effectively, enhancing the dynamics of the game. Additionally, in engineering, ball-type components like ball bearings reduce friction and improve efficiency in machines.