The simultaneity in sign language refers to the ability to run multiple signs with hands and use at the same time the face and the body to convey more information. The simultaneity is a distinctive feature of the language of signs and allows you to communicate complex information quickly and effectively. For example, a sign language interpreter can use the simultaneity to quickly interpret a conversation between two people, using the hands to perform the signs, and the face and the body to convey additional information, such as emotion, intonation, the position of the subject, and more.