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An icon is a simplified graphic or symbol that represents something to your learner, such as an action, idea, or entity. Icons are useful for conveying meaning to your learner quickly with low cognitive load. For instance, using a right arrow to guide your learner to the next page of a book is simpler, less-distracting, and faster than showing a button that says "Go on to next page." As such, icons are simple, stylized representations of something you want your learner to do or to understand, and most visual learning design projects, like apps, websites, or infographics, will use icons extensively.
In terms of ARC, icons must first-and-foremost be readily discernible for what they are, meaning that comprehension is paramount, followed by retention and then appeal. This means that you should make choices in your design that favor simplicity, recognizability, and conformity to intuition and norms over novelty, detail, or complexity.
Any visual learning design project is much simpler if you start with a library of pre-existing components, such as icons, fonts, buttons, and badges, and there are many free libraries of resources online that can help you. Icons are particularly helpful, because they can be used for a variety of purposes, such as buttons, graphics, logos, and bullet points, and because the meanings of many icons have become almost universal (e.g., a right-pointing arrow means "next," an "X" means "cancel" or "delete," and three horizontal lines means "menu"). You can find great examples of many of these common icons in existing free libraries, such as Font Awesome and Feather Icons.
However, no font library will have all of the icons you will need for every project. Also, icon sets have different themes; so, even if you find a "right arrow" icon that someone else made, it may not match the other icons you are using in your project. For these reasons, it's important to learn how to make simple icons.
Create your own, original library of icons using Adobe Illustrator or another program.