What 3d shape has 8 faces 19 edges 12 vertices?

Answer 1

According to Euler none; for all 3d shapes:

Vertices + Faces = Edges + 2

⇒ 12 + 8 = 19 + 2

⇒ 20 = 21

So unless 20 does equal 21, no 3d shape has 8 faces, 19 edges and 12 vertices.

Any 3d shape with 8 faces would be an octahedron.