noun
ring book; ring binder
A notebook or binder with rings, typically used for loose-leaf paper.
新しいリングブックを買って、授業のノートを整理した。
I bought a new ring book and organized my class notes.
Variant with interpunct; less common in everyday writing.
バインダー is a more general term for any binder, while リングブック specifically refers to a book-style binder with rings.
Loanword from English 'ring book'.