This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
璒 is a rare character. It combines 王 (jade) on the left with 登 on the right, suggesting a type of jade or jade-related object. The exact historical development is uncertain.
The left side 王 suggests jade or a precious stone. The right side 登 looks like a climbing shape. Imagine a rare jade artifact that one must climb to find, but its exact meaning is unclear.
For トウ, imagine a toe-shaped jade ornament: toe -> トウ, and the jade piece is shaped like a toe.