よれい
bell signalling that work, class, etc. will formally begin shortly; first bell; warning bell
Noun
予鈴よれいだ。校門こうもんの辺あたりにいた生徒せいとたちが一斉いっせいに足あしを速はやめる。
It's the class bell. The pupils that had been around the school gate quickened their steps as one.