I can think of no crochet abbreviation which would fit this. I wonder if it is the price on a British pattern? Before the present currency was adopted, an old penny was given the symbol 'd'.
when something is 2D it means it is a flatshape
d miens dimension 2d miens 2dimensions
This might mean two-dimensional.
Dimension.
It means 2d whereas 3d means three dimensional
2d, or an unfolded version of a shape
Can be. It would be the net of the polyhedron.
a 2D shape that's round
2d means 2 dimensional or flat figures. If you are dealing with algebra or graphing, it would mean X and Y coordinates only, not Z.
2D is two dimensions and 3D is three dimensions. 2D and 3D animation is animation that works in 2D and 3D. Often, 3D is used instead of 2D in order to enhance the perception of quality, even though the 3D is rendered on a 2D visual field. Its a matter of perspective. (Pun intended.)
a flat pattern is when you take a 3D shape and you basically unfold and flatten the shape so it's in 2D
2D CAD = two dimensional computer aided drafting. 2D CAD is like drafting on paper on a drafting board. 2D CAD is a old way of doing CAD. Nowdays, The new way is three dimensional CAD.