CA5 stands for Carbonic Anhydrase V (enzyme)
CA4WDC stands for California Association of 4 Wheel Drive Clubs, Inc.
CA4PRS stands for Construction Analysis for Pavement Rehabilitation Strategies
CA4P stands for Combretastatin A-4 Phosphate
CA4DP stands for Combretastatin A-4 Disodium Phosphate
CA4 stands for Central American Four (El Salvador, Guatemala, Honduras, Nicaragua)
Ca3N2 stands for Calcium Nitride
CA3 stands for Carbonic Anhydrase 3 (gene)
CA2RS stands for California Association of Accident Reconstruction Specialists (est. 1998; San Jose, CA)
CA/C stands for Convergence Accommodation to Convergence (optometry)