Oh, dude, a triangular prism in 2D is called a triangle. It's like a triangle, but missing that extra dimension to make it a prism. So yeah, just a good old triangle in flatland.
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it a triangle as a 2d shape
No, it is a 3D shape.
A triangular prism is a 3-d object. It does not have a 2-d name because it is not a 2-d object!
triangular prism or triangular pyramid
It will look like a 2D equilateral triangle if it is a triangular based pyramid which is called a tetrahedron.