The suprainterparietal bone, also known as the "ossified supraoccipital ligament", is a structure found in some animals such as reptiles and birds. This bone is situated at the back of the skull and is commonly referred to as the "inca bone" due to its distinctive shape. However, it can also be called the "parietal bone" as it connects with the parietal bones of the skull. Another synonym for the suprainterparietal bone is the "occipital bone" since it is situated near the occipital region of the skull. Overall, these alternatives describe the same cranial bone, highlighting its various names within the field of anatomy.