"Bon toro" (also called "bon doro," written as "盆燈籠" in Japanese) is a lantern-shaped decoration, which is dedicated to the dead at a grave during the season of "Obon" (an annual festival of the dead) in Japan.
盆燈籠（ぼんとうろう、ぼんどうろう）とは、日本のお盆の時期に、墓に供える燈籠型の飾り。