This is one of the more widely used acronyms in science, with many well established uses and excellent SEO. The Free Dictionary show 74 uses of this acronym, many with science connotations. With N standing for numerical, nuclear, national, etc., and C standing for centre, code, corporation, college, commission, collaboration, etc, possibilities abound. It also would work well for a biotech startup, with for example the N standing for nanoscience or nanotech or natural, and the C for corporation. The domain name is already registered until July 2022, so you don't need to renew it for a long time (and it renews at standard .science rates after that)!