2D

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A square has 2 dimensions: length and width.

2D or two-dimensional uses two measurements of an object: width and length, like a square. Two-dimensional objects do not have depth, like a cube. It's a mathematics tool, but it's also used in video games, and computer science.

Throughout maths, it is used in geometry and other categories.

In video games, it is used as a perspective, like in Grand Theft Auto 1 and 2.