This query is the only one I've located so far, that poses the same question I wish to have answered.
I saw one of these icons, in a family tree that I ran across tonight.
It shows the DNA helix, and a man. It is very eye catching! I knew immediately that this male line had their y-DNA known.
On thinking about it, we are able to upload an icon or photo to each person added to our tree. I could make one myself. Or, I suppose I could get a generic icon from the Internet and use it. Just so it communicates the message.
I hated to see this orphan message so ignored for so long and not drop a little something in the hat.