Cats and Human Sign Language
Cats cannot learn sign language in the way humans do. They lack the cognitive structures for complex symbolic language and are not naturally motivated to use it.
Hand Signals Are Possible
You can teach cats to associate simple hand gestures with actions through positive reinforcement and consistency. Examples include pointing to a food bowl for mealtime or a hand signal for "come."
Keep signals simple, be consistent, and reward correct responses with treats or praise.