d miens dimension
2d miens 2dimensions
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the 2d means 2 letter d and the 3d means 3 letter d . example: 2d= d d 3d= d d d
A piece of paper is 3D.
2d
3d.
A line (2D), ray (2D), vector (2D), line segment (2D), a mobius strip (3D), or a klein bottle (3D).