During action movies, the people use hand signals to communicate; are those hand signals sign language?

for example a fist means stop, a 2 finger point means go, but where can i learn ALL the other ones? do they chane every few years? is it not open to the public? so, are all these hand symbols sign language that regular civilians know and learn? .

Signs of Service: Master “sign Language” to Communicate With your Customers

I was visiting a client for the first time, the Union Sanitary District, 40 miles from my office in the San Francisco Bay Area, in an industrial part of Union City, bounded by swampland and factories. But I was far from lost. – As I exited the freeway onto a major thoroughfare, a […]

Using Sign Language And Music To Communicate With Your Newborn

Playing in his crib at 10 months old, Ezekiel calmly got his mother’s attention and signed “more music.” Realizing only then that the mobile had stopped, his mom wound it up again and Ezekiel continued playing happily. A hearing child in a hearing family, he has been exposed to sign language since birth. Not […]