| Abbreviation | Definition |
|---|---|
| CIV | Conversation Verb Interface |
| CIVDDD | Centre for Innovation in Information Visualization and Data-Driven Design |
| CIW | Certified Internet Webmaster |
| CJB | Custom Jim Bob |
| CKD | Count Key Data |
| CKO | Chief Knowledge Officer |
| CL | Command Line |
| CL | Control Language |
| CL | Core Image Library |
| CLB | Configurable Logic Block |
| CLC | Color Laser Copier |
| CLEAR | Clear Logic Edits And Rules |
| CLED | Conectiva Linux Enlightened Desktop |
| CLI | Call Level Interface |
| CLI | Command Line Interface |
| CLI | Command Line Interpreter |
| CLIM | Compaq/Lotus/Intel/Microsoft |
| CLLI | Common Language Location Identifier |
| CLNS | Connectionless Network Service |
| CLP | Courteous Logic Program |