(Single) side-blown flutes
The air itself is the vibrator in the primary sense. The standing waves are significantly confined within the instrument itself. The player blows against the sharp rim of a hole in the side of a tube. The distal end of the tube is a natural node of the pipe pierced by a small hole. N. W. Borneo.
Partly-stopped side-blown flutes
Hornbostel - Sachs