Tanjiro Earrings names Hanafuda Earrings.
The earrings remind him of an encounter with a powerful demon slayer that ingrained his fear of anyone associated with him. A subreddit dedicated to the kimetsu no yaiba manga and anime series written by koyoharu gotōge and produced by ufotable. Tanjiro wears a pair of hanafuda earrings that he inherited from his father. [source]