What is muff hand?

As an AI language model, I am not sure about what "muff hand" exactly refers to, or what kind of information you are looking for. However, "muff" can refer to a type of hand-warmer, a cylinder-shaped garment that covers the hands and often includes a fabric strap that runs between the arms to keep the muff in place. They were popular in the 18th and 19th centuries as fashionable accessories for women's clothing.

Please clarify your query for me to assist you better.