This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
皕 is a doubling of 百 (one hundred), likely representing two hundred. The exact historical development is uncertain.
Two 百 characters side by side suggest a large number, perhaps two hundred, but the kanji has no clear modern meaning.
For ヒョク, imagine a heavy yoke (ヒョク) made of two hundred (百 + 百) wooden beams tied together.