C80 may refer to : HMS Mauritius (C80), a 1938 British Royal Navy cruiser Final Articles Revision Convention, 1946 code New Coalinga Municipal Airport FAA LID Ruy Lopez chess openings ECO code Malignant neoplasm without specification of site ICD-10 code Caldwell 80 (Omega Centauri or NGC 5139), a globular cluster in the constellation Centaurus C80, carbon-80, a fullerene