A glottal stop is the speech sound made by briefly stopping the airflow through the vocal cords. It is a common feature in many languages, including English, and is usually represented by the symbol "?" in the International Phonetic Alphabet. However, there are many different words that can be used to describe this sound, depending on the context and the language being spoken. Some synonyms for the glottal stop include h-sound, cough sound, interrupted sound, and catch in the throat. Additionally, some languages have specific terms for this sound, such as the Hawaiian "okina" or the Arabic "hamza".