This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
姄 combines 女 (woman) with 民 (people), but the exact historical development and original meaning are uncertain.
A woman 女 among the people 民, but the intended meaning is lost. Remember it as a mysterious kanji with no clear definition.
For ビン, imagine a woman named Bin who is part of the people: Bin -> ビン.
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