This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
玭 combines 王 (jade) with 比, which likely contributes the sound. The exact historical development is uncertain.
The left side is 王 (jade), and the right side is 比 (compare). Picture comparing two pieces of jade, but the overall meaning remains unclear.
For ヒン, imagine a hinge made of jade: hinge -> ヒン, though the kanji's meaning is uncertain.