This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
蔢 combines the grass radical 艹 with 婆, but the exact historical development and original meaning are uncertain.
The top grass radical 艹 suggests a plant, and the bottom 婆 (old woman) might hint at a plant used by elderly women, but the meaning is unclear.
For ハ, imagine an old woman (婆) laughing 'ha!' under a grass plant: ha -> ハ.
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