snub disphenoid

Etymology
So named in 1966 by mathematician in his classification of the Johnson solids. See also

Noun

 * 1) A non-regular convex polyhedron that has 12 equilateral triangles as faces and 18 edges and is a Johnson solid.

Hypernyms

 * polyhedron with faces that are all equilateral triangles
 * polyhedron with twelve faces