Homonym: 2-D (Flat)
"2-D" refers to two-dimensional space, which has only two dimensions: length and width. This means that objects in 2-D do not have depth, making them flat. Common examples of 2-D shapes include squares, circles, and triangles.
In art and design, 2-D refers to images or graphics that exist on a flat surface, such as paintings, drawings, and digital illustrations. These works can convey depth through techniques like shading and perspective, but they remain fundamentally two-dimensional in nature.