The estimate of the number of languages ​​in the world varies between 5,000 and 7,000, yet any accurate estimate depends in part on the arbitrary distinction between languages ​​and dialects. Natural languages ​​are either spoken or sign language, but any language can be encoded into secondary media using audio-visual cues or Tactile, for example, in pictorial writing, Braille for the blind, or whistling, because human language is an independent language. The term "language" when used in a general sense can refer to the cognitive ability to teach and use a complex communication system, or to describe a set of rules that make up these systems, or a set of statements that can result from those rules depending on the philosophical viewpoints relating to the definition of language. Language and meaning. All languages ​​depend on the process of signs becoming to indicate certain meanings. Spoken or spoken language and sign language contain an audio system that controls how symbols are used to form strings known as words or morphemes, and a grammatical system that controls how words and morphemes combine to form phrases and sayings.