We call is "MOCKUPS", but you may call them: previews, prototypes, simulations, renderings, designs, drafts, layouts, concepts, templates, visualizations, demonstrations, samples, storyboards, scenarios, illustrations, proposals, blueprints, schematics, models, depictions, virtual models, digital proofs, concept art, visual aids, project mockups, design mockups, creative visuals, presentation models, design simulations, prototype designs, event visualizations, digital sketches, pre-visualization...