A physical model refers to a tangible representation of a product or concept which helps to visualize and understand how it functions in real-world scenarios. Some of the synonyms for a physical model include mockup, prototype, scale model, 3D model, clay model, and miniature model. A mockup is a simplified model used to test a design's ergonomics or visual appearance. A prototype is a functional model used to test a product's functionality before large-scale production. A scale model is an exact replica model of a larger object. A 3D model refers to computer-created models that showcase a product's appearance or working mechanism. Clay models are used to study the shape and texture of products. Lastly, miniature models are smaller-sized versions of a product that can fit in your palm.