An avatar group shows multiple avatars.
The avatar pile separates each avatar and works well in scenarios where there’s sufficient space in the layout.
The avatar stack is a more condensed configuration in which the avatars overlap each other and works well where space is confined.
If there are more people or groups than can fit within a defined space, show an overflow avatar in the last available slot to indicate an exact number of associated entities. Single avatars are not always interactive and so may not receive focus. However, overflow avatars can generally display a popup menu to show a detailed list of people.
Activity and presence
Both the avatar pile and stack support activity rings but neither support presence badges.
It may be difficult for people with visibility impairments to perceive the icon in presence badges on medium avatars (32 pixels) and smaller. Where possible, accompany these avatars with a textual representation of their status.