The sign says so much and yet so little. At the corner of Rivers and Durant avenues in North Charleston, there’s a bluish sign featuring what appears to be a howling dog and telling you exactly where you are: the Iron Dog Business District. Take that French Quarter. Suck it, Olde Village. North Charleston has the mother trucking Iron Dog Business District. But what is the Iron Dog District? We have no idea, we’ll let you know when we find out.