A television set is a 3D shape. The image (picture) on the television screen is a 2D shape.
3D is when it has length, width, and height.
2D is only length and width.
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A piece of paper is 3D.
A nonagon is a 2D shape and there is not a 3D equivalent shape.
The suffix "hedron" implies 3D. The 2D suffix is "gon"
A rhombus is a four sided polygon, a quadrilateral. It is a 2d shape. 2d shapes have 2 dimensions, like length and width. 3d shapes have 3 dimensions, like length, width and depth.
It doesn't have any volume (3D) and it's not a line (1D). Thus, it is a 2D shape.