Opening one arm to the side, fingers closed and palm facing the other person, is a gesture of peaceful intentions: "Look, I have no weapons in my hands or coat", "I surrender to your will", or "Thank you for your benevolent kindness." Making the spirals that you ask about is the equivalent of saying "Thank you very very very much." It's a way of emphasizing what you mean, but it quickly gets un-creative if you repeat it too often.

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