Open single end-blown flutes
Open single end-blown flutes with fingerholes
The air itself is the vibrator in the primary sense. The standing waves are significantly confined within the instrument itself. The player creates a ribbon-shaped stream of air with his/her lips, blowing against the sharp rim at the upper open end of a single tube. The lower end of the flute is open. The instrument has fingerholes. Almost world-wide.
Hornbostel - Sachs