This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 兾 is uncertain. It may be a variant or simplified form of 冀, which combines 北 and 異, but the modern form's origin is unclear.
The top 丷 looks like a pair of horns, and the bottom 異 suggests something unusual. Imagine a strange horned creature whose purpose is unknown, reflecting the kanji's uncertain meaning.
For キ, picture a key unlocking the mystery of this rare kanji: key -> キ, and the key helps you remember the reading even when the meaning is unclear.