Glottalstop

A glottal stop or glottal plosive is a type of consonantal sound used in many spoken languages, produced by obstructing airflow in the vocal tract or, more precisely, the glottis. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ʔ⟩. As a result of the airflow in the glottis, the glottal vibration either stops or becomes irregular with a low rate and sudden drop in intensity.