From your description, the wrist stretch sounds similar Gyaku Sankyo. Of course, this term may be unique to my dojo. Different dojo will refer to wrist stretches with different terms. An example would be the term Sankajo instead of Sankyo. Both are correct, the diffence I believe is that one word is of an older dialect than the other. In our regular Sankyo wrist stretch, the hand is first held in front of your body, palm facing yourself. You then grab the hand in front of you with your free hand and rotate it in such a fashion that your palm will first face the floor and then away from you. It's a little hard to describe in writing. I hope I've helped a little.