sceptre
瓛 refers to a sceptre, a ceremonial staff or rod symbolizing authority.
瓛 combines 王 (jade, king) with 獻, which likely contributes the sound and the idea of offering or presenting, suggesting a jade sceptre as a ceremonial object. The exact historical development is uncertain.
The left side 王 suggests jade or royalty, and the right side 獻 looks like an elaborate offering. Picture a jade sceptre being presented as a royal gift.
For カン, imagine a king holding a sceptre shaped like a can: can -> カン, and the jade sceptre is as solid as a metal can.
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