～巻
～かん · ～kan · JLPT N2 · noun
volume
📜📚 巻 means to roll up: old books were scrolls, so each volume was one roll
On its own, 巻く (maku) means to roll or wind. Before bound books, a long text was split across several rolled scrolls, so ～巻 became the counter for volumes: 第一巻 = volume one.