What is the meaning of ?

any shellfish with a spiral shell

spiral shellfish, especially smaller ones

Synonym of (hamaguri, clam)

spiral shellfish, especially smaller ones

edible marine whelks of family Buccinidae

Synonym of 田螺 (tanishi, river snails of family Viviparidae)

spiral shellfish, especially smaller ones

certain shellfish with a spiral shell

Alternative spelling of (nina, Synonym of 川蜷 (kawanina, melanian snail, Semisulcospira libertina))

Source: wiktionary.org