Level X of XX on the frequency path
Frequency rank 1237 / 2,608
Rarer in this ranking, but still part of the 2,608-character published set.
More common than 糸 (Thread), less common than 績 (Achievement).
The character looks like a bookshelf with vertical slats — a neat rack of thin books lined up on a shelf, each one a single volume you can count.
冊 is rank 1237 of 2,608 in published Japanese.
Study 冊 →