A rosette
One of the fifteen rosettes in the horizontal row lying in the middle of the façade of S. Maria Novella, in Florence.
You can see an other one; or you can see a drawing of the same rosette.
The rosette has a dihedral symmetry type D5 (for the central star; otherwise the symmetry type would be D10...).
© matematita
foto di F. Martín Casalderrey
The image belongs to the sections...:
*5. (D5) (Symmetry)
Decorations of walls and façades (Anthology of images)
Decorations of walls and façades (Symmetry)
Of higher order (Symmetry)