The artistic message in sign language is also of a different nature, using visual rather than acoustic effects, offering more opportunities to enrich the content of the utterance (K. Diehl 1995). Interestingly, similar grammar rules using word order in a sentence have developed in all sign languages of the world. There are many of these languages, and there is also the Gestuno International Sign Language, developed by an international team of experts from the World Federation of the Deaf.
This language is used in official international contacts of the deaf, at congresses, seminars, games and sports meetings, etc. However, regardless of the existence of international sign language, deaf people from different countries can communicate with each other much more easily than hearing people if they only use their own languages.
A characteristic of all sign languages is the iconic character of the signs that define specific concepts – and therefore their unmistakable similarity to the shapes of objects or movements performed during the activities they define. Hence, concrete concept signs are often similar to each other, and sometimes even the same in different sign languages.
Examples: The telephone sign is done identically in many sign languages. Placing a clenched fist on the cheek, but with the thumb and little finger straightened to mimic a telephone receiver, is available in Polish, American, German, Australian, Brazilian, Swedish and many other sign languages, as well as the international GESTUNO language. .