If you need a sign that is not mounted on a building or structure, you need a sign that can stand on its own. Freestanidng signs do not use support from any other structure, by using its own inner architecture. You'll find these signs frequenlyby the roadside where there is little or no secondary support.
A freestanding sign with visible support structure. A free standing sign can be mounted on a round pole, square tube or other fabricated member without any type of secondary support.