| Abbreviation | Definition |
|---|---|
| COD | Children Of Doom |
| COE | Council Of Elrond |
| COI | Community Of Immortality |
| COP | Citizens Of the Pentagram |
| CoS | Chamber of Secrets |
| COS | Cracco Outerspace Special |
| COST | Church Of the Samurai Troopers |
| COTC | Clan Of The Cauldron |
| COV | City of Villains |
| CPR | Candlesticks Pattern Recognition |
| CRB | Carpo Research Base |
| CRM | Controllable Regex Mutilator |
| CROW | Cybernetic Remotely Operated Woman |
| CRPT | Coal Region Paranormal Team |
| CRV | Comatose Remote Viewing |
| CSAF | Cyber Space Armed Forces |
| CSD | Corrective Service Darkstar |
| CSF | Christian Science Fiction |
| CSFF | Centre for Science Fiction and Fantasy |
| CSI | Counter Strike Incorporated |