This stop was reportedly invented by Paul Ott, and first used in a residence organ for Hugo Distler in 1938. It was intended as a more compact substitute for a 16' flue stop. From its name, we can infer it to be a form of Dulzian with resonators shaped like a funnel (trichter).
Trichterdulzian 16', Pedal; Hugo Distler residence, Lübeck, Germany; Ott 1938?. The organ has been rebuilt several times, and it is unclear whether the current stop is the original.