Carbonaceous chondrite, a type of meteorite CC (cat), also known as CopyCat, the first genetically cloned pet C-C, a locomotive classification; see AAR wheel arrangement Chief complaint, a medical patient's primary reported symptom Classification of Types of Construction, for buildings Closed captioning, a process of displaying text on a visual display Complex conjugate, a pair of complex numbers reflecting each other across real axis Coupled cluster, a numerical technique in computational chemistry Corpus callosum, a white matter tract in the brain that connects the left and right hemispheres Cosmological constant, in cosmology, the cosmological constant is the value of the energy density of the vacuum of space Cubic centimetre (cc), a unit of volume Engine displacement, where cc is used as shorthand for the cylinder volume in cubic centimetres Complex conductivity (measurement method), a measurement method in geophysics