Geommu (검무), also transliterated as gummu or kommu, is a Korean dance performed with swords. It is traditionally performed with twin sseong geom (Korean short swords).
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Oroku Karai is trained in geommu, although she practices it with a single katana and uses it to also hack away at a training dummy. When practicing it, her grandfather and recognizes it, and she tells him it's one of the many forms she uses to train with.