2D really means everything that you can draw on paper. So, for example, pictures and texts. SketchUp two-dimensional structures, such as the levels and texts.
Two-dimensional bodies will be able to look at different sides, but still have only two dimensions. A good example is the two-dimensionality of Super Mario games, and platform games in general, because they can move up, down, forward, backward, but not the sides.
Kaksiulotteisuus means the space spanned by two vectors. This space is called the level. Vectors are usually designated coordinates in the x and y axes. The position indicated in the coordinate system of coordinates (x, y) where x and y indicate the origin on the x-and y-in components. The place can get a positive and negative components x and y axes.