Whorl

For other uses, see Whorl (disambiguation).

A whorl (/wɜːrl/ or /wɔːrl/) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs).^[1][2]

Main whorled patterns.

In nature

For further examples, see Spiral and Concentric objects.

• 
  Botanical whorls: sepals, petals, leaves, or branches radiating from a single point (photo of flower of Friesodielsia desmoides, family Annonaceae, juxtaposed with diagram of axial cross-section)
• 
  Mollusc whorls: Each complete 360° turn in the spiral growth of the shell of the mollusc Anisus septemgyratus, family Planorbidae.
• 
  A hair whorl is a patch of hair growing in a circular direction around a visible center point.
• 
  In a fingerprint, a whorl is each ridge arranged circularly around a central point on the finger.
• 
  In histopathologic architecture, a whorled pattern consists of multiple concentric objects, or a spiral-shaped pattern. Bone tissue is shown.

For mollusc whorls, the body whorl in a mollusc shell is the most recently formed whorl of a spiral shell, terminating in the aperture.

Artificial objects

• 
  A spindle whorl is a disc or spherical object fitted onto the spindle to increase and maintain the speed of the spin.

See also

• Whirl (disambiguation)

References

1. "whorl". Dictionary.com. Retrieved 2022-12-26.
2. Jawarneh, Ibrahim & Alsharman, Nesreen (2021). "The Mathematical Model and Deep Learning Features Selection for Whorl Fingerprint Classifications". International Journal of Computational Intelligence Systems. 14: 1208. doi:10.2991/ijcis.d.210318.002. S2CID 233022744.{{cite journal}}: CS1 maint: multiple names: authors list (link)

External links

• The dictionary definition of whorl at Wiktionary