It doesn't exist. The least number of sides for a 3-D shape only made of triangles is 4.
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A hexahedron or a triangular dipyramid. This is the shape formed by two triangular pyramids (tetrahedrons) stuck together along one triangular face.
a triangular pyramid
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they are: ---sided pyramids and triangular prisms and 20 sided 3d shapes
Triangular prism