Notch
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| Notch | |
|---|---|
 | |
| Rank | 3 |
| Elements | |
| Faces | 4 scalene triangles, 2 isosceles triangles |
| Edges | 1+2+2+4 |
| Vertices | 1+2+2 |
| Vertex figure | 2 isosceles triangles, 2 kites, 1 rhombus |
| Measures (edge length 1) | |
| Central density | 1 |
| Related polytopes | |
| Army | Notch |
| Regiment | Notch |
| Dual | Wedge |
| Conjugate | Notch |
| Abstract & topological properties | |
| Euler characteristic | 2 |
| Surface | Sphere |
| Orientable | Yes |
| Genus | 0 |
| Properties | |
| Symmetry | K2×I, order 4 |
| Convex | Yes |
| Nature | Tame |
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.