noun
facet
FAS-it/ˈfæsɪt/
A distinct flat surface of a solid object.
Each polished facet of the gemstone reflects light at a different angle.

Etymology
A facet is literally a “little face,” originally a surface of a cut diamond. That physical image became a figurative way to describe one aspect of a many-sided subject.
In context
Explore each facet of your subject carefully and make sure to consider multiple influences on events.