Practical Response - Sketching and Concept Development

Iconography is an important element in user interface design: 'Icons are an essential part of many user interfaces, visually expressing objects, actions and ideas. When done correctly, they communicate the core idea and intent of a product or action, and they bring a lot of nice benefits to user interfaces, such as saving screen real estate and enhancing aesthetic appeal. Last but not least, most apps and websites have icons. It’s a design pattern that is familiar to users' - Nick Babich,
https://www.smashingmagazine.com/2016/10/icons-as-part-of-a-great-user-experience/.