Creaky voice

Creaky voice (also called laryngealisation or vocal fry, especially in the US), is a special kind of phonation in which the arytenoid cartilages in the larynx are drawn together; as a result, the vocal folds are compressed rather tightly, becoming relatively slack and compact, and forming a large, irregularly vibrating mass. The frequency of the vibration is very low (20-50 pulses per second) and the airflow through the glottis is very slow. A slight degree of laryngealisation, occurring e.g. in some Korean consonants is called "stiff voice".

See: breathy voice, slack voice