卷
カン, ケン, ま.く, まき

volume, book, part

JLPT0 G13 S0 F5000

As per ?# as described in 券 (wrap/roll up) + a bending figure → *curl*; *roll*; *roll up*; *reel*; *coil*; *wind* (up/around) → *volume* (of a set of *books*, originally, rolled *scrolls*).

[Full Kanji Etymology List]