noun
exchange diary; shared diary between friends
A notebook passed between friends (often schoolgirls) who take turns writing entries, similar to 交換日記.
See also: 交換日記
中学生のとき、友達と交換ノートをしていた。
When I was in junior high, I kept an exchange diary with a friend.
Synonym; 交換ノート uses ノート (notebook) instead of 日記 (diary), but the practice is the same.
Compound of 交換 (exchange) and ノート (notebook).