What is the meaning of Whorl?

Each circle, volution or equivalent in a pattern of concentric circles, ovals, arcs, or a spiral.

A circle of three or more leaves, flowers, or other organs, about the same part or joint of a stem.

A volution, or turn, of the spire of a univalve shell.

Any volution, as for example in the human ear or fingerprint.

A flywheel, a weight attached to a spindle.

To form a pattern of concentric circles.

Source: wiktionary.org