The anular ligament of radius is a fibrous band that encircles the head of the radius bone, located in the forearm. While it is important in ensuring the stability and movement of the radius bone, there are a few other synonyms that can be used to refer to this structure. These include the annular ligament of the radius, the ring-like ligament, and the circular ligament. In medical contexts, it is also referred to as the ligamentum anulare radii or the fibrous ring of radius. Regardless of the term used, it is a vital component of the forearm and plays an essential role in the complex mechanics of the wrist and elbow joint.