To say hello in American Sign language, place your hand up to your forehead as if you are going to salute, then pull your hand outward away from your forehead. To say a more informal hi, simply wave your hand once from left to right.
American Sign Language is a language that combines hand signs, facial expressions and body postures to communicate with individuals who are deaf or hard of hearing. As of 2015, experts do not know when ASL was officially formed and became a language. Many believe it originated approximately 200 years ago when French Sign Language mixed with local sign languages. This is supported by the fact that ASL contains elements of both French Sign Language and the local sign languages that existed at the time. ASL is different than English, as it has its own pronunciation, word order and grammatical rules.