Which musical instrument was known as a buisine, during the Middle Ages?

Buisine, long, straight trumpet of the Middle Ages, used for military and ceremonial purposes and, later, for music. It was a six-foot- (almost two-metre-) long counterpart of the shorter trompe, a straight military trumpet, and ultimately gave rise to the later S-shaped and coiled forms of the trumpet.

The name derives from Latin buccina, a Roman shepherds’ and later military horn made first of animal horn and subsequently of metal. The later buisine was made of brass, copper, or silver.

They are played by blowing air through nearly-closed lips (called the player's embouchure), producing a "buzzing" sound that starts a standing wave vibration in the air column inside the instrument. Since the late 15th century they have primarily been constructed of brass tubing, usually bent twice into a rounded rectangular shape.