(1) (Computer Telephony Profile) See Bluetooth profiles.
(2) (Computer-To-Press) Printing directly from the computer. Since all common computer printers are essentially computer-to-press, this usage of the CTP acronym is more ambiguous than definition #3 below. It could refer to a large digital printer or to "on press" plate making (see DI press).
(3) (Computer-To-Plate) The production of printing plates directly from the computer. Also called "direct-to-plate," CTP is the digital replacement for the manual, time-consuming chemical processing that is performed when making plates from film. CTP is a stand-alone "off press" procedure, and the finished plates must be transported to and mounted on the offset printing press. The plates are mostly aluminum, but polyester, polymer and silicon are also used. For details about "on-press" plate making, see DI press.