High Quality Content by WIKIPEDIA articles! The voiceless velar plosive is a type of consonantal sound used in many spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is k, and the equivalent X-SAMPA symbol is k. The [k] sound is a very common sound cross-linguistically. Most languages have at least a plain [k], and some distinguish more than one variety. Many Indian languages, such as Hindi and Bengali, have a two-way contrast between aspirated and plain [k].