The suprainiac fossa is an elliptical depression on the occiput above the superior nuchal line, or inion, or a dent in the back of the head. Suprainiac fossae were common anatomical features of Neanderthals but are rare in modern Humans.[1][2]
References
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^Nowaczewska, Wioletta (2011). "Are Homo sapiens nonsupranuchal fossa and neanderthal suprainiac fossa convergent traits?". American Journal of Physical Anthropology. 144 (4): 552–63. doi:10.1002/ajpa.21437. PMID21404232.