殻 - husk, nut shell

(Earth's) crust

cigarette end; cigarette butt; tobacco ashes

diastrophism (movement and deformation of the earth's crust)

shell; husk; hull; pod; chaff

seashell; shell

conchoidal fracture

cochlea

adductor muscle (of a bivalve)

Japanese wineberry (Rubus phoenicolasius); wine raspberry; wineberry

skeleton shrimp (Caprella mutica); spectre shrimp; specter shrimp

Ghost in the Shell (film)

hard-shelled nut (e.g. walnut, pecan, almond)