In the "All proposals" view I noted that some proposals (obviously very new ones) are preceded by a star, e.g.
at this moment. What does the star mean?
The indicator only shows which open proposals are less than three days old (and thereby still subject to the Minimum Activity Requirements for Area 51).
The asterisk (*) was originally visible only to employees only so I could see which proposals were still in those "opening days" before I spent too much time vetting their content. I found it really useful, so I suggested making that information public to remind the author and Area 51 regulars that the proposal was still subject to removal if not completed per the minimum requirements. There was a better UI that was supposed to go with it, but it doesn't look like that was implemented yet.