whistle
whistle is an open flute with internal duct without fingerholes or sound generator.
Overview
Instrument which produces sound from a stream of forced air.
In detail
Its recorded use is signal instrument and musical instrument.
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
“Whistle”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q204917: whistle
Consult the source