school bell
school bell is a bell or alarm device.
Overview
Sound making device designed to communicate with students.
In detail
school bell is a bell or alarm device.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“School bell”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q862131: school bell
Consult the source