What do you mean by "mother instrument world"?

Generally described as a queen or mother who cares for the world with maternal love.

Mother instrument: the way to be a mother stipulated in feudal society.

People often say that the queen is the son of heaven, just like the father of the people, so the queen is the mother of the people. She should act like a mother, be kind to others and everyone, so the queen should be the mother of the world.