What did Helen Keller write in hand?

Helen Keller wrote in braille, which is a tactile system of reading and writing for the blind. She did not write in hand.

While she learned to read and write in braille, she also learned to communicate using sign language and later learned to speak.

It's important to remember that Helen Keller was a strong advocate for people with disabilities and her experiences and writings helped to change how people thought about blindness and deafness.