Polygon
From polycount
Polygon is a flat surface on a 3d model, defined by a series of vertices.
Most game engines use polygons to make the surfaces of their objects. A polygon can be made up of 1 or more triangles, like a quad is made of two triangles, a pentagon is made of three triangles, etc. Some engines support multiple polygon types, but triangles are the most common.
Some people use the term polygon to specify a quad, others use it when talking about triangles. Polygons are also called polys, or sometimes N-gons. See also Face, Fan, Quad, Strip.
See also Polygon Count.
