default icon
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default icon is an icon used to represent typically a person or author that lacks their own icon or photo, in a reply-context, or responses like comments or likes, or new accounts on silos that have not yet uploaded a photo.
IndieWeb Examples
Aaron Parecki
Aaron Parecki uses a gray on gray minimal abstract person icon to represent the icon of responses without one. E.g. one of the bookmarks on this post
Silo Examples
GitHub
GitHub uses a blocky two color pixelated square as a default icon
Twitter went through various default icons over the years:
Latest as of 2017-03-31: