冊 means “counter for books, volume”

さつ · satsu

Also: tome

Kun'yomi (Japanese reading)
ふみ
On'yomi (Chinese reading)
サツ, サク

JLPT N2 · Taught in grade 6 · 5 strokes

The story

Bamboo slips standing side by side, tied by a cord running across: a book as it was before paper. 冊 counts books, so 一冊 is one book and 何冊 how many, and a 冊子 is a slim booklet.

Used in 一冊 (issatsu, one book), 冊子 (sasshi, booklet), and 別冊 (bessatsu, separate volume/supplement)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.