The letters of the alphabet whose sound is formed by some form of contact, or near contact, between the different parts of the mouth ( for example, ΓÇ£mΓÇ¥, ΓÇ£dΓÇ¥, or ΓÇ£wΓÇ¥) or by friction of the air passing between different surfaces (for example, ΓÇ£sΓÇ¥, ΓÇ£fΓÇ¥ or ΓÇ£vΓÇ¥) . Some consonants are further defined as ΓÇ£voicedΓÇ¥ or ΓÇ£unvoicedΓÇ¥, depending upon whether the vocal folds continue to vibrate as the consonant is sounded. For example, ΓÇ£vΓÇ¥ is the voiced form of ΓÇ£f ΓÇ£ which is unvoiced.
