Meaning
螺 (つぶ, Tsubu) is Whelk, a Japanese food (water animals).
What is Whelk?
Tsubu means "whelk", which is a common name that is applied to various kinds of sea snail. In Japan, whelks are frequently used in sashimi and sushi. Left: ma-tsubu Middle: tōdai-tsubu Right: iso-tsubu