中
チュウ, なか, うち, あた.る, あたる, かなえ

in, inside, middle, mean, center

JLPT5 G1 S4 F11

The relevant oracle bone form of this character shows banners centered on the flagpole run through them → *center/middle* → *inside* → *throughout*; *including*; *the mean*.

[Full Kanji Etymology List]