The baritone saxophone is a member of the saxophone family of instruments, larger than the tenor saxophone, but smaller than the bass. Wikipedia

One of the largest members of the saxophone family Wikipedia Disambiguation

Member of the saxophone family, smaller than the bass, contrabass and subcontrabass saxophones. It is the lowest-pitched saxophone in common use, and uses a mouthpiece, reed, and ligature that are larger than the tenor, alto and soprano saxophones. Wikidata

A member of the saxophone family of woodwind instruments that is smaller than the bass saxophone but larger than the tenor saxophone, with a range of D♭2 to A4 or similar. Wiktionary

Brass instrument. Wiktionary (translation)