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Mathematics Low‑priority This redirect is within the scope of WikiProject Mathematics, a collaborative effort to improve the coverage of mathematics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.MathematicsWikipedia:WikiProject MathematicsTemplate:WikiProject Mathematicsmathematics Low This redirect has been rated as Low-priority on the project's priority scale. Polyhedra This redirect is within the scope of WikiProject Polyhedra, a collaborative effort to improve the coverage of polygons, polyhedra, and other polytopes on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.PolyhedraWikipedia:WikiProject PolyhedraTemplate:WikiProject PolyhedraPolyhedra

The triangular bi-pyramid is two tetrahedra stuck end to end, they do not intersect. It has 6 facets, 9 edges, 5 points - from one direction a four facet point and from the other a 3 facet point. Does it count as a compound tetrahedron?