Labial consonants are sounds produced by closing or partially closing the lips. These types of consonants are considered to be among the most common phonemes in the world's languages. Some common synonyms for labial consonants include bilabial consonants, which are produced by closing both lips (such as "p" and "b"). Another synonym is labiodental consonants, which are produced with the lower lip touching the upper front teeth (such as "f" and "v"). Other examples of labial consonants include labialized velar consonants, which combine a velar consonant (like "k" or "g") with rounding of the lips, and labiovelar consonants, which result from a combination of a bilabial and velar articulation.