Spoken language, is language produced by articulate sounds, as opposed to written language. Many languages have no written form, and so are only spoken. Oral language or vocal language is language produced with the vocal tract, as opposed to sign language, which is produced with the hands and face. The term "spoken language" is sometimes used to mean only vocal languages, especially by linguists, making all three terms synonyms by excluding sign languages. Others refer to sign language as "spoken", especially in contrast to written transcriptions of signs.