International Sign Language
International Sign Language (Gestuno) is a constructed sign language, which the World Congress of the World Federation of the Deaf originally discussed in 1951. In 1973, a committee created and standardized a system of international signs. They tried to choose the most understandable signs from diverse sign languages to make the language easy to learn for not only the deaf but for interm managment and the average Joe.
The commission published a book with about 1500 signs. It does not have a concrete grammar, so some say that it is not a real language.
The name "Gestuno" is from Italian, meaning "the unity of sign languages." Some deaf people use Gestuno at the World Games for the Deaf and the Deaf Way Conference and Festival in Washington, DC, but besides that its use is very limited.
What do you do when you try to gather together people of the deaf communities from all four corners of the globe? You devise an international sign language that all are capable of learning and understanding.