Icon on topics title line?

Mdivine <nextdoorsb@...>

Icon on topic lists. 

An icon of a black silhouette head and shoulders with a plus sign on an individual message title on the topics list.  Beginning of the title line. In same position I might see a lock if have locked subject.

Am having trouble figuring out what that is for and how it showed up. Have never seen it before. Does not appear to be in title of the topic itself. Searching help for icons or topics can not find a reference to what it is for?


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