strange, strangeness, curiosity
竒 centers on something that stands out as unusual or unexpected: strangeness, oddity, and the curiosity it provokes.
竒 is a variant form of 奇, which combines 大 (big) with 可 (possible/approval) to express something extraordinary or unusual. In 竒, the top is 立 (stand) instead of 大, but the core idea of strangeness remains.
The top 立 (stand) and bottom 可 (possible) together suggest something standing in a way that is barely possible—so odd that it makes you curious.
For キ, imagine a key that opens a box of strange curiosities: key -> キ, and the strange contents make you curious.