Description A ratchet, also called a noisemaker or Knarre (German) (or, when used in Judaism, a gragger, grogger, or gregger (etymologically from Yiddish: גראַגער‎), raganella or ra'ashan (Hebrew: רעשן‎)), is an orchestral musical instrument played by percussionists. Operating on the principle of the ratchet device, a gearwheel and a stiff board are mounted on a handle, which rotates freely.
On Wikipedia
Parent instrument Percussion