Estimated minutes: 10 min
Designer: Tomoaki Hamanaka
A triangular pyramid formed by deforming an obtuse triangular pyramid using a three-dimensional twisting fold. Its defining feature is a left–right asymmetric structure.
Parents

Obtuse Triangular Pyramid
A flattened triangular pyramid whose apex solid angles are all 90 degrees. It is used as a fundamental element for forming the vertices of cubes and rectangular prisms.