Used to describe advertising devices.
Outdoor advertising devices have many different forms and aspects, and they are visible by everybody in landscape.
They participate to the economic life of a site, and are necessary for trade and industry.
They can play a role of landmark and be used by people to orientate in the (urban) landscape.
But their many can generate 'visual pollution' and badly transform the landscape, by intruding their commercial messages into public space.
In any case, they play an important role in defining what a particular site or area really looks like.
For all these reasons, it is legitimate to have them into OSM.
This table is a wiki template with a default description in English. Editable here.