I too have seen sororities greet each other this way. One of my closest friends is a Delta and has said O00P-Zee to me and I have switched it up and done it to her. We were friends long before either one of us had any organizational affiliation. It's not unheard of but like SkeeWee14 said, it's not something that's done on a regular basis.
I've never called someone in another organization Soror, and I have never heard it done, but I have heard people use the term Sister-Soror, it's just a way of showing a little bit of greek love.
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