予鈴 よれい
yorei

Noun

1. bell signalling that work, class, etc. will formally begin shortly; first bell; warning bell

Related to 本鈴
予鈴 よれい。校門 こうもん あたりにいた生徒 せいとたちが一斉 いっせい あし はやめる。
yorēda. kōmonno atarini ita sētotachiga issēni ashio hayameru.
It's the class bell. The pupils that had been around the school gate quickened their steps as one.