Whorl

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

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