What is tanjiro earring?

Tanjiro's earring is a unique wooden earring in the shape of a gourd that he wears on his left ear. It was given to him by his father and symbolizes his strong connection to his family and his ancestors. The earring also has some special power that allows Tanjiro to sense the presence of demons. When this power is activated, the earring glows in a bright green color. The earring is one of the crucial tools that Tanjiro relies on throughout his journey to become a demon slayer and protect his loved ones from the demonic threat.