systemIcon property
A system icon which will be used in a image that represents the content of the tab.
SF Symbols provides a set of over 3,100 consistent, highly configurable symbols you can use in your app. Apple designed SF Symbols to integrate seamlessly with the San Francisco system font, so the symbols automatically align with text in all weights and sizes.
See:
IMPORTANT: All SF Symbols shall be considered to be system-provided images as defined in the Xcode and Apple SDKs license agreements and are subject to the terms and conditions set forth therein. You may not use SF Symbols—or glyphs that are substantially or confusingly similar—in your app icons, logos, or any other trademark-related use. Apple reserves the right to review and, in its sole discretion, require modification or discontinuance of use of any Symbol used in violation of the foregoing restrictions, and you agree to promptly comply with any such request.
Implementation
final String systemIcon;