SF Symbols provides thousands of consistent, highly configurable symbols that integrate seamlessly with the San Francisco system font, automatically aligning with text in all weights and sizes.

SF Symbols | Apple Developer Documentation

https://developer.apple.com/design/human-interface-guidelines/sf-symbols#Animations

The new Apple SF Symbol animations are such a cool solution for supporting basic animations - using layers & groups in the SVG to create diff animations that can be used on all icons. Love this.

https://developer.apple.com/design/human-interface-guidelines/sf-symbols#Animations

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