The terms "ball and sockets" are used mainly in biology and anatomy to describe a joint where the rounded head of a bone fits into a cup-like cavity of another bone. However, there are various other synonyms used to describe this type of joint in different fields. In mechanics, they're termed as universal joints, while in engineering, they can be referred to as swivel joints or rotary joints. Astronomers might call them gimbals or rotary mounts, while in construction, they may be simply termed as hinges or pivot points. These various synonyms describe the same functional principle of movement that applies to ball-and-sockets joints.