oo渦

whirlpool

whirlpool; eddy; vortex; something shaped like a whirlpool; indentation; concavity; a <<river>> in <<p/Henan>> and <<p/Anhui>>, <<c/China>>

English Wiktionary, “渦” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E6%B8%A6 · confidence: Medium (Wiktionary, Hokkien)