冊
satsu
Bind it and give it a spine: 一冊
The picture Sheets stacked and stitched along one edge. That spine you feel when you pick it up is what 冊 counts.
Where the picture shows up in 冊
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the bundle you borrow
図書館で本を三冊借りました。
toshokan de hon o sansatsu karimashita
I borrowed three books from the library.
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the bundle still blank
ノートを一冊ください。
nōto o issatsu kudasai
One notebook, please.
Loose sheets take 枚; once they're bound and have a spine, they take 冊.
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the bundle that comes out regularly
この雑誌を二冊買いました。
kono zasshi o nisatsu kaimashita
I bought two copies of this magazine.
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the one you keep at hand
辞書は一冊あれば十分です。
jisho wa issatsu areba jūbun desu
One dictionary is plenty.
本 (ほん) means 'book', but the counter for books is 冊, not 本.
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asking how many bundles
何冊まで借りられますか。
nansatsu made kariraremasu ka
How many can I borrow at a time?
The sound shifts: 一冊 issatsu, 八冊 hassatsu, 十冊 jussatsu.