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screw

pond snail (Viviparidae spp.)

cross-head screw

ball screw

screw propeller

screw pump

boasting

perplexed spindle (species of sea snail, Fusinus perplexus)

logarithmic spiral

helicoid

Archimedean spiral

helix

double helix (structure of DNA)

Umbonium costatum (species of sea snail)

veined rapa whelk (Rapana venosa)

big talk

snail

warty frog shell (Bursa bufonia dunkeri)

trapezium horse conch (Pleuroploca trapezium)

spiral

spiral

tapestry turban (species of turban shell, Turbo petholatus)

turban shell (any mollusc of the family Turbinidae, esp. the horned turban, Turbo cornutus)

screw propeller

helical

spiral staircase

screw pump

mother-of-pearl inlay

small spiral-shelled snail

spiral curl on the head of a statue (symbolic of enlightenment)

biluochun (green tea var. grown in Jiangsu, China)

Tectus maximus (species of top shell)

Omphalius pfeifferi pfeifferi (subspecies of top shell)

Ezo neptune (species of whelk, Neptunea polycostata)

arthritic neptune (species of whelk, Neptunea arthritica)

bladder moon shell (Glossaulax didyma)

Thais clavigera (species of rock shell)

double-sculptured neptune (species of whelk, Neptunea intersculpta)

nacre