noun
bell signaling the official start of work or class
Used in school or workplace settings to mark the formal beginning of a period, as opposed to a warning bell (予鈴).
See also: 予鈴
本鈴が鳴ったら、すぐに授業を始めます。
When the start bell rings, we'll begin class right away.
予鈴と本鈴の間は5分間です。
There is a five-minute interval between the warning bell and the start bell.