04-05-2018 09:44 AM - edited 04-05-2018 09:49 AM
Out of the box, I think it is Read/Unread status (a black or white dot, you can toggle manually or is turned off when you do ). But I turned it off (right click in the Headings in display and untick it) so long ago, it is hard to remember. If stars, it is a "rating option". both are equally useless to me, but were requested options. the Read/unread status can be turned off automatically depending on your settings in preferences (see image) when you open the record, for example. The bold and non-bold is another visualization of read/unread status, if that preference is set (again see the image attached). -- I have them all off and not displayed.