An icosahedron is a polyhedron that has 20 faces, 30 edges, and 12 vertices. In the realm of 3D design, it's a geometric shape that you might encounter for various purposes. Here's a breakdown of its key uses:

• Complex structures: It serves as a building block for more complex 3D structures.
• Low-poly modeling: For creating simplistic yet visually striking models, designers often use shapes like the icosahedron.
• Gaming: Due to its symmetry and simple structure, it's often used in game design for dice or other symmetrical objects.
• User interface elements: Sometimes you'll find icosahedrons in interactive designs where the shape's various faces can represent different options or outcomes.