- A regular octahedron is an octahedron that is a regular polyhedron. All the faces of a regular octahedron are equilateral triangles of the same size, and exactly four triangles meet at each vertex. A regular octahedron is convex, meaning that for any two points within it, the line segment connecting them lies entirely within it.
- Granite Mountain (King County, Washington) (Wikipedia)
Granite Mountain is a tall peak in the Cascade Range in King County, Washington 16 miles (26 km) east of North Bend. A fire lookout on the summit can be reached by trail. The fire lookout was first constructed in 1924 and was then rebuilt 31 years later. It is still maintained by volunteers June through September each year.