What is the key anatomical feature that indicates a male skull characteristic?

The key anatomical feature that indicates a male skull characteristic is the frontal eminence. In general, male skulls tend to have a more pronounced frontal eminence, which contributes to a more prominent forehead. The frontal bone in males is often more robust, and the overall shape can give the forehead a steeper incline compared to that of female skulls, which typically exhibit a smoother contour.

While other features mentioned, such as the glabella, zygomatic arch, and mastoid process, do have variations between male and female skulls, the prominence of the frontal eminence is a more distinct and easily identifiable characteristic used in sexual dimorphism studies of skull morphology. This distinct feature is beneficial in forensic anthropology and related fields for determining the sexual characteristics of skeletal remains.