Quote

Parietal - (adjective) 1: of or relating to the walls of a part or cavity 2: dated: of or relating to college living or its regulation.

(noun) - anatomy-  any of several parts in the parietal region of the skull, especially the parietal bone

Quote

In the old days, the parietal rules at universities stated that women were not allowed in the men's dorms after dark.  (This is not an issue for most of the members of the site, I'd wager.)

The parietal bone makes up the sides and top of the skull. 

For more information - https://www.dictionary.com/browse/parietal?s=t