What makes an Iconic?
A darn good question, I have wasted many a second pondering this too...
I have noticed that some "Iconics" write in the third person character (ie- Regdar), but that must be difficult to do all the time, so they probably also have other login ID's.
They are the true Iconics.
I think the term is evolving, and most posters with an "Iconic" signature file image are probably awarded them by their fellow posters for various reasons.
I also think that "Eyeconic Eye" should be adopted by MEG Hal immediately. I'f I had the skill, I would create a banner for him with his blinking eye GIF in the middle of an "Eyeconic Eye" line of text.