The original designer is said to have later mused that he would invert the symbol, as his original design came from a feeling of despair - head bowed, arms pleading - merged with semaphore signals N-D. The original symbol is iconic and will not fade, though many invert it intuitively and would easily recognize the inversion as the peace symbol. Inverted it may still represent pleading, but also the possibility of rejoicing and all-emcompassment. The semaphore would now read U-D Universal Disarmament. Very little you can/should do to something which universally says so much to so many.