If you're referring to a triangle waveform, it's commonly used for bass in NES music.
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
There are many different types of triangles. A few are a right triangle, obtuse triangle, equilateral triangle, acute triangle and isosceles triangle.
A chiming sound
because its a triangle
When you hit it, it makes a sound.
A triangle has high pitch.
a triangle makes a sort of 'Ting' sound witch is made when you hit the triangle with a metal beater!
The triangle
a metal rod
When you hit it, it yells in pain.
The harder you hit it - the more the triangle vibrates, and the louder the sound it produces.
Usually a triangle-esque figure.
When you hit it, the triangle vibrates, and the air around it vibrates. The air particles closest to it vibrates, then the air particles next to the first ones start vibrating as well and so on, so it reaches your ear.
The triangle is not in the brass family. It is in the percussion family because it is struck with a small mallet in order to produce sound.