Flageolet /(?)/

Flag·eo·let

Flageolet

n.
  1. A small wooden pipe, having six or more holes, and a mouthpiece inserted at one end. It produces a shrill sound, softer than of the piccolo flute, and is said to have superseded the old recorder. (Mus.)

Phrases & Compounds
Flageolet tones
the naturel harmonics or overtones of stringed instruments.