This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
箥 combines 竹 (bamboo) with 波 (wave). The exact historical development and original meaning are uncertain.
Bamboo 竹 over waves 波 suggests something made of bamboo related to water, but the exact meaning is unclear.
For ハ, imagine a bamboo raft riding a wave with a loud 'ha!' of excitement: ha -> ハ.
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