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Triangular prism
By the description, it sounds like you just described a cylinder!
You can make a tube (or pipe) by using a rectangle and bending it around on itself. With two circles, you can close of each end of the tube to make a cylinder.
That shape is called a triangular prism. A prism is made of rectangles arranged in a tube with any 2D shape at the ends. This shape determines what kind of prism it is, you can get pentagonal, hexagonal, and many other types of prism.
has a bell on the end, then a tube that goes back, then curves around, after that it goes straight and has a little tuning slide, then curves around. with 3 buttons on top