regular tetrahedron (noun)

1. In the horror movie, the main character discovers a regular tetrahedron hidden in a cursed ancient artifact.

2. The animated series features a regular tetrahedron as the main character's magical companion.

3. The interior designer incorporated a regular tetrahedron-shaped light fixture in the living room to add a unique and modern touch.

4. The science fiction film depicts an alien civilization using regular tetrahedrons as a form of advanced technology.