N-gon
From MC Animation and Rendering Wiki
More actions
In polygon-based modeling, n-gons are faces that consist of 5 or more vertices. In contrast to quads and tris, n-gons are often discouraged in 3D modeling, as different programs may handle them differently, nor is there a guarantee that they are shaded consistently. In addition, n-gons may cause issues with most 3D algorithms, such as subdivison surface.
Use of n-gons may be acceptable in some circumstances, such as completely flat surfaces, or to make topology cleaner. However, with meshes that must either be exported or deformed, n-gons are typically discouraged.