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That is a group flair. You can find the documentation here:

Add group flair on member avatars

This is a guide for configuring automatic group flair on user avatars in Discourse. Required user level: Administrator Automatically add group flair to members’ avatars Group avatar flair displays to the bottom-right of a user’s avatar, providing a stylish way to highlight a user’s group membership. When creating or configuring a group, an admin can choose an image or Font Awesome icon to use as group flair. [Group Flair Example] Summary This guide cover…