If you're referring to a triangle waveform, it's commonly used for bass in NES music.
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A chiming sound
When you hit it, it yells in pain.
An equilateral triangle based anti prism is simply a "normal" octahedron, as described by someone trying to make things sound more complicated than they are. It has 6 vertices.
any triangle is a triangle
acute angled triangle,right angled triangle,obtuse angled triangle,isosceles triangle,equilateral triangle, scalene triangle