This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
巙 combines 山 (mountain) with 夔, a rare component possibly related to a mythical creature. The exact historical development is uncertain.
The mountain radical 山 sits beside the complex shape 夔. Without a known meaning, picture a mysterious mountain creature whose name is lost.
For キ, imagine a key (キー) hidden on a mountain marked by this rare kanji: key -> キ.
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