Labial sounds
The lips are not only anatomic features of note, they are organs of speech essential to certain articulations.
A sound requiring the participation of one or both lips is a labial (labium in Latin means lip) sound or, simply, a labial.
All labials are consonants.
There are bilabial sounds such as 'p' which involve both lips and labiodental sounds such as 'v' which involve the upper teeth and lower lip