变棱双五角椎，又名扭棱锲形体或变形双五角锥，是几何学上的一个詹森多面体（J₈₄），是一个只由等边三角形作平面的三维立体，所以是一个三角面多面体。

In geometry, the snub disphenoid, Siamese dodecahedron, or dodecadeltahedron is a three-dimensional convex polyhedron with twelve equilateral triangles as its faces. It is not a regular polyhedron because some vertices have four faces and others have five. It is a dodecahedron, one of the eight deltahedra (convex polyhedra with equilateral triangle faces) and one of the 92 Johnson solids (irregular convex polyhedra with regular faces).