This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鉊 combines 金 (metal) with 召, which likely contributes the sound. The exact historical development is uncertain.
The left side is metal 金, and the right side is 召 (summon). Picture a large metal pot being summoned for cooking.
For ショウ, imagine a show where a large metal pot is the star: show -> ショウ, and the pot is made of 金.