In the Dungeons & Dragons roleplaying game, Oerth is the fictional planet on which one of the earliest campaign settings, the World of Greyhawk, is located. Oerth has an axial tilt of 30 degrees, which would cause greater seasonal temperature variation than on Earth, were it not for wizardly and divine magic that shifts weather patterns to be more favorable to the populace (at least the god-fearing folks). == Development == Castle Greyhawk was the most famous dungeon in Oerth, the home campaign world of Gary Gygax. Players in the earliest days of this campaign mostly stayed within Castle Greyhawk...

In geometry, a tetrakis hexahedron (also known as a tetrahexahedron, hextetrahedron, tetrakis cube, and kiscube) is a Catalan solid. Its dual is the truncated octahedron, an Archimedean solid. It also can be called a disdyakis hexahedron or hexakis tetrahedron as the dual of an omnitruncated tetrahedron. == Orthogonal projections == The tetrakis hexahedron, dual of the truncated octahedron has 3 symmetry positions, two located on vertices and one mid-edge. == Uses == Naturally occurring (crystal) formations of tetrahexahedra are observed in copper and fluorite systems. Polyhedral dice shaped like...