I am getting ready to order a Blue American Legion name tag, item 790.112B, which allows for up to 4 lines of lettering. (I like the magnetic back name tags. They are much easier to keep straight.) I was thinking that on the fourth line, I would have them engrave my ham call, something along the lines of below (of course using the typical centering);
Amateur Radio N9LBG
A good way to "advertise" ham radio in your post or other events where you wear your name tag.