In a hospital what is a Sister?

Particularly in Australia, but also other countries, how does a sister differ from an ordinary nurse?In a hospital what is a Sister?
The title Sister is an old one when hospitals used to be run by the church and all the nurses were part of the clergy.
a sister is a nurse who is also a nun in the US
Sister is the chief of the nurses. Usually they are selected based on experience.
A Sister is the charge nurse on a ward. In England and other areas, all nurses are called sisters. In America, they are all called nurses or charge nurse if she is the authority on the ward.
She is a nun in the Catholic Church that is also a nurse.

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