What was Caesar saying in sign language the rise of planet apes?

In the film "Rise of the Planet of the Apes," Caesar doesn't use sign language to communicate with humans. He uses a combination of American Sign Language (ASL) and his own invented signs.

While ASL is a widely recognized and used language, Caesar's signs are unique to his own experience and understanding. He develops these signs as he learns and grows, reflecting his increasing intelligence and awareness of his own species.

Therefore, while Caesar does communicate with humans through a form of sign language, it's not strictly ASL, but rather a combination of ASL and his own invented signs.