Sign language
Spoken words are made up of smaller pieces: individual sounds like "p" or "o". In the same way, signs are made up of smaller pieces: handshapes, movements and locations of the hands, facial expressions and other body movements. These pieces are used in different combinations to make the signs in the language Some signs are made with only one hand, and others are made with both hands. Some signs include movements of the mouth or other parts of the body; without those other movements, the sign is not correct. Other body movements are also important in the grammar. For example, in many sign languages, raised eyebrows indicate a question that has a "yes" or "no" answer.