Hiraikotsu

Hiraikotsu (&#39131;&#26469;&#39592;) is the favorite weapon of Sango the demonslayer, from the popular anime and manga InuYasha. It is a giant boomerang made from the bones of demons. She utters the weapon's name when she throws it.

The kanji mean "fly", "come" and "bone" repectively. It was also her father's weapon used by him when he found the Shikon no Tama. This was shown in a later episode.