Dictionary/螺旋らせんRasen螺旋 (Rasen) is a Japanese noun meaning “spiral, helix, screw”.Meaningsnounspiral; helixnounscrewKanji in 螺旋螺small, edible, helical fresh-water mollusk旋rotationRelated words螺子screw斡旋good offices旋回revolution旋律melody旋風whirlwind