The interparietal bone, an important part of the human skeletal system, is also known by several other names, serving as synonyms. This bone, located at the back of the skull, is commonly referred to as the "ossified portion of the membranous interparietal suture" due to its development from the junction of the two parietal bones. Additionally, it is often termed the "inca bone" due to its presence and prominence in the cranium of the ancient Inca civilization. Another synonym for the interparietal bone is the "os incae", derived from Latin, which can be translated as the "bone of the Inca". Regardless of the name, this bone plays a vital role in the overall structure and stability of the human skull.