This weapon wielded by Temari is a giant Japanese war fan that has three purple circles along its metal body that she calls "stars" ("moons" in the English dub). The strength of the gusts of wind she creates is indicated by how many stars are shown (one being the weakest, three being the strongest). The fan itself can also be used as a club or to block attacks. It also seems to be able to deflect kunai and shuriken when opened and can also be lodged in the ground.
During the Fourth Shinobi World War, two other Sunagakure shinobi were seen wielding similar fans alongside Temari. This might be an indication that the use of these fans may be a skill taught in the village.