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Peh said:
The_Liquid_Laser said:

0 Dimensional - a point (a dot)
1 Dimensional - part of a line; a line segment (a stick)
2 Dimensional - part of a plane; often polygons (especially in video games).  Two dimensional shapes have a one dimensional border like a line segment or a curve.  This defines the two dimensional interior.
3 Dimensional - part of space, often polyhedrons (especially in video games).  Three dimensional shapes have two dimensional borders such polygons.  These borders define the three dimensional interior.  When you see calculations about number of polygons rendered they are talking about the exterior of a shape.  More polygons enables more smoothness and definition.

I'm not into that dimension stuff, but a dot has to appear at least in 1 dimension in order to be recognised as a dot. 

You are thinking too literally.  If we are going to be that literal then there is no 1D or 2D.  Everything in reality is 3D.  A sheet of paper is 3D, because it has thickness even if it is very small.  The TV screen is also 3D because the screen has a thickness just like the sheet of paper.

I am speaking in mathematical terms.  In mathematical terms, a dot has no dimension.  Like when you graph a point with (x, y) coordinates, the point is considered to have no dimension.  We have to draw it big enough to see it, but it is considered to have no dimension.