Final answer:
A pivot joint allows for rotational movement only, functioning as a uniaxial joint and found in areas such as between the radius and ulna and the C1 and C2 vertebrae.
Step-by-step explanation:
The synovial joint that allows for rotational movement only is known as a pivot joint. An example of this type of joint is the articulation between the radius and ulna, which enables the rotation of the forearm, allowing you to turn your palm up and down. Another instance is the joint between the C1 (atlas) and C2 (axis) vertebrae, where the pivot joint facilitates the side-to-side rotation of the head. These pivot joints are functionally classified as uniaxial because they allow for movement around a single axis.