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NNS can stand for: New neoclassical synthesis (economics) NASCAR Nationwide Series (previous name of the NASCAR Xfinity Series) Nashville Number System (music) National Numeracy Strategy (UK education) Near Net Shape Nearest neighbor search Nearly-new sale Newport News Shipbuilding, a shipyard Nigerian Navy Ship (NNS) Nippon Television Network System Non-Nutritive Sweetener, i.e. a Sugar substitute