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|Faces||4 scalene triangles, 2 isosceles triangles|
|Vertex figure||2 isosceles triangles, 2 kites, 1 rhombus|
|Measures (edge length 1)|
|Symmetry||K2×I, order 4|
A notch, so named for the shape that looks like a V-shaped cut, is a variant of a triangular bipyramid constructed as the dual of the wedge. It has 2 isosceles triangles and 4 scalene triangles as faces. Notches also include bipyramids based on the isosceles triangle.