イ, こと, こと.なる, け
uncommon, queerness, strangeness, wonderful, curious, unusual
JLPT1 G6 S11 F631
The relevant oracle bone form of this character shows 廾 pair of hands raised straight above to the sides of a person's head (in affixing a crown). *Different* and *unusual* are extended meanings (← person different from all others, and thus unusual).
[Full Kanji Etymology List]