What does grandma mean?

Grandma is mother's name in the south, and it is also grandma's name.

Grandma is a grandmother in the north, which is just the difference between the north and the south. That is, mom's mom. If it's mom's father, you can call it grandpa or grandpa. Dad's mother is grandma, and dad's father is grandpa. In the south, grandma refers to parents' grandparents.