Most sounds in human language that come from the vocal apparatus can be classified according to where the parts of the tongue contact parts of the throat or mouth, known as the articulation position. This can be conveniently classified starting from the very back of the throat to the front of the mouth. As shown in the Figure at right, this starts with the glottal and ends with the bilabial position.
Sounds of human language are also classified phonetically according to the following: