WowAce

I noticed something strange while raiding with this lovely Addon

the symbols on the map for me are :

- shield, which are tanks
- a cross , those are healers
- a triangle, shows damagedealers, rogues, druids, warlocks and so on

Now i have seen a 4th icon, the circle. Could someone tell me what exactly this stands for?

Also i think there are Problems in detecting a players role. I have had raids where the tanks werent marked as tanks and some of the players (warriors and pallys) were marked as protection so i ended up with 6 shield symbols on my map ;)