It is important to learn and remember the name of 3D shapes. A 19 faced 3d shape is called a nonadecahedron.
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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.
It is called an endacehedron.
A decahedron.
pentacontahedron
It is called a Triacontakaidigon.