This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
珆 combines 王 (jade) with 台, which likely contributes the sound. The exact historical development is uncertain.
The left side 王 suggests jade or a precious stone, and the right side 台 looks like a pedestal. Picture a rare jade artifact displayed on a stand, but its exact purpose is unclear.
For イ, imagine an eagle (イーグル) perched on the jade pedestal: eagle -> イ, and the bird guards the mysterious stone.