This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鉯 is a rare character combining 金 (metal) with 以, but its historical origin and original meaning are uncertain.
With no clear meaning, picture a mysterious metal object marked with the shape 以. Its purpose is unknown.
For イ, imagine an eagle (イーグル) perched on the metal object: eagle -> イ, and the bird guards the unknown artifact.
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