Welcome to the forums Portchy, isn't it nice that you make your first post then we change everything on you? At least you don't have to relearn everything.
WARNING: SLIGHT POSSIBLE SPOILERS BELOW
As for your question, I don't recall Paul ever specifically saying the design was Hindu or meant to represent Shiva, the Goddess of destruction, it does make sense though in the way you word it. The design is very intentional though as it correlates to another symbol within the books. I am not sure if you have read "Fatal Error" or not yet, but many questions are answered in that novel which sets the stage for the climactic battle sure to rage in "The Dark at the End".