trombas marina

A form of tromba marina — A Middle Ages European string instrument with a long, slender and triangular-shaped body, featuring one main string and sometimes additional sympathetic strings, known for an extremely loud sound making it useful for signalling between ships, and for a distinctive ethereal tone (harmonic overtones) created by the player fingering the string at precise intervals below the point where the string is to be bowed, rather than above as most similar instruments.