不知火

Etymology
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From 🇰🇲. Literally “unknown fire”, incorporating the kanbun or Chinese-derived spelling for the  portion.

First attested in a text from 1470.

Noun

 * 1)  a marine will o' the wisp, more specifically one seen off the coasts of Kyushu in the  or

Derived terms

 * : an alternate name for the Yatsushiro Sea

Proper noun

 * 1) a place name

Derived terms

 * : one of the kata (routines) performed by a yokozuna (highest sumo rank) when entering the dohyō (sumo ring)