What is the meaning of 螺?

any shellfish with a spiral shell

spiral shellfish, especially smaller ones

synonym of 蛤 (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 蜷 (nina, “synonym of 川蜷 (kawanina, “melanian snail, Semisulcospira libertina”)”)

Source: wiktionary.org