transposing instrument
transposing instrument is a musical instrument or type of musical instrument.
Also recorded as transposing musical instrument; transposing instruments.
Overview
Instrument for which music is conventionally written transposed to a different pitch.
In detail
transposing instrument is a musical instrument or type of 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
“Transposing instrument”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q217306: transposing instrument
Consult the source