That icon is just telling you that there is currently some warning or notification. It might happen if the car is low on fuel or a door is open, or it might happen if the car has just been rearended or your engine just exploded.
In this case, as others point out, it looks like a seatbelt warning. How did we come to this conclusion? Because, there's a giant seatbelt icon there too. See it?
Now, if you put on your seatbelt and the wanring triangle remains, then there is something else amiss. To find out what, use the computer to check current faults (instructions in manual).