| C2D | Character to Decimal |
| C2X |
Character to Hexadecimal (REXX language function)
|
| CADD |
Computer Aided Design and Drafting |
| CBEMA |
Computer & Business Equipment Manufacturer's Association (replaced by
ITIC)
|
| CCFL |
Cold Cathode Fluorescent Lamp (replaced by
LED bulbs/lamps)
|
| CCSD |
Cellular Circuit Switched Data |
| CDC |
Century Date Change (19xx to 20xx or
Y2K, 20xx to 21xx and so on) |
| CDDA |
Compact Disc Digital Audio
|
| CDPD |
Cellular Digital
Packet Data
(CDPD service retired in 2005) |
| CDTV |
Commodore Dynamic Total Vision |
| CDXA |
Compact Disc Extended Architecture |
| CEO | Celestial Ephemeris Origin (
astronomy) |
| CFI |
CAD
Framework Initiative (renamed to Si2) |
| CFM | Cold Fusion Metafile |
| CHS | Cylinder Head Sector
(HDD) |
| CIM |
Computer Input by Microfilm
|
| CIX |
Commercial Internet eXchange
|
| COFF | Common Object File Format (replaced by
ELF) |
| COM | Computer Output to Microfiche/Microfilm |
| CPHB |
Computer Protocol Heart Beat
(IANA number 73)
|
| CPM | Cards Per Minute
(punch card based systems) |
| CPS | Characters Per Second |
| CGMS-A | Copy Generation Management System -
Analog |
| C-VGA | Color
VGA |
| CD-I |
Compact Disc Interactive
|
| CP/M |
Control Program/Monitor (later known as Control Program for Microcomputers) creator - Gary Kildall
|