| Abbreviation | Definition |
|---|---|
| CAKT | Computer-Assisted Keyboard Training |
| CAM | Caribbean Air Mail |
| CAS | Case Analysis System |
| CASS | Coding Accuracy Support System |
| CAST | Computer-Assisted Scheme Training |
| CC | Cocos (Keeling Islands) |
| CC | country code |
| CDB | Corporate Data Base |
| CDPIM | Carrier Delivery Process Improvement Meeting |
| CEPT | Center for Excellence in Postal Technology |
| CF | Central African Republic |
| CFS | Computerized Forwarding System |
| CG | Congo |
| CH | Switzerland |
| CI | Cote D'Ivoire (Ivory Coast |
| CIF | Cost, Insurance, and Freight |
| CIIS | Comprehensive-Interactive Information Strategy |
| CIOSS | Combined Input/Output Subsystem |
| CIS | Corporate Information System |
| CK | Cook Islands |