S50W is a direction - approximately SouthWest) in two dimensional space. In a 3D problem, by itelf, S50W has no meaning at all.
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3d stands for '3-dimensional', meaning that the shape has three parametres (or directions) for its space, usually translated as it has length, width, and height.
It means 2d whereas 3d means three dimensional
3D means that the picture or movie has depth. Like, it looks like the picture is jumping out at you. 2D is like a drawing on a piece of paper. It has no depth.
They are points where three or more edges meet.
I think you mean the word 'sphere' ? It's pronounces 'sfeer'