The term for a three-dimensional shape is "solid." Solids are characterized by having length, width, and height, unlike two-dimensional shapes, which only have length and width. Common examples of solids include cubes, spheres, cylinders, and pyramids, each with distinct properties and characteristics. In geometry, solids can be further classified into regular and irregular shapes, depending on whether their faces, edges, and angles are uniform. Understanding three-dimensional shapes is fundamental in various fields, such as architecture, engineering, and design, facilitating practical applications in the real world.