螺 - small, edible, helical fresh-water mollusk

spiral; helix

screw

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

small spiral-shelled snail; spiral shellfish

Archimedean spiral

logarithmic spiral; equiangular spiral

helicoid

screw pump

Ezo neptune (species of whelk, Neptunea polycostata)

whelk (esp. Neptunea and Buccinum spp.)

Omphalius pfeifferi pfeifferi (subspecies of top shell)

screw