Post and panel is the workhorse of external signage: a printed or fabricated panel between two posts, set into the ground. It suits school entrances, car park regulations, estate maps, site rules and anywhere the message matters more than the object.
It is also the easiest external sign to specify badly. Panels on softwood posts and paper faced board will not last a year. Aluminium panels on galvanised or treated posts will outlast most of the signage on the building.