C4I2TSR stands for Command, Control, Communications, Computers, Intelligence, Information, Technology, Surveillance, and Reconnaissance
C4I2SR stands for Command, Control, Communications, Computers, Intelligence, Information, Surveillance, and Reconnaissance
C4I2 stands for Command, Control, Communications, Computers, Information, Intelligence C4I2 stands for Command, Control, Communications, Computing, Intelligence and Information Systems
C4I stands for Command, Control, Communications, Computers, & Intelligence (US DoD) C4I stands for Community Climate Change Consortium for Ireland…
C4H10 stands for Butane (chemistry)
C4H stands for Cinnamate 4-Hydroxylase
C4G stands for Center for GeoInformatics (Louisiana State University; Baton Rouge, LA)
C4FMO stands for Command, Control, Communications, and Computers
C4FM stands for Constant Envelope 4-Level Frequency Modulation
C4FCM stands for Center for Future Civic Media (MIT; Cambridge, MA)