A rosette is before anything else a symmetric

A rosette is before anything else a symmetric geometrical figure having more or less the shape of a rose or a star.

She(It) is built in a circle from a central point and trained(formed) by curves.

This shape calling on(appealing) to the mathematics is present in architecture, in decoration, in sewing, joinery(joiner's workshop), etc. …

The rosette is used in many religions for centuries.

We find in the Christian buildings, but also in the mosques there or in representation in the mandala Indian.