螺 - small, edible, helical fresh-water mollusk

spiral; helix

screw

mother-of-pearl inlay

spiral staircase

snail

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

ball screw

Umbonium costatum (species of sea snail)

nacre; mother of pearl

Ezo neptune (species of whelk, Neptunea polycostata)

whelk (esp. Neptunea and Buccinum spp.)

Omphalius pfeifferi pfeifferi (subspecies of top shell)