Cast Iron Rosettes

A rosette is a round, stylized flower design, used extensively in sculptural objects from antiquity. The rosette derives from the natural shape of a rosette in botany, formed by leaves radiating out from the stem of a plant and visible even after the flowers have withered. The formalised flower motif is often in carved in stone or wood to create decorative ornaments for architecture and furniture. A common motif in metalworking, jewelry design and the applied arts at the intersection of two materials, or to form a decorative border.

Rosette decorations have been used for formal military awards. They are also used to decorate musical instruments, such as around the perimeter of sound holes of guitars.

Reference:
Wikipedia