deltahedron
polyhedron whose faces are all equilateral triangles
edge-contracted icosahedron
polyhedron with 18 triangular faces
triangular bipyramid
bipyramid over a triangle
stellated octahedron
polyhedral compound
triangular tiling
tiling of the plane by equilateral triangles
pentagonal bipyramid
third of the infinite set of face-transitive bipyramids
great icosahedron
Kepler–Poinsot polyhedron