| Abbreviation | Definition |
|---|---|
| CR | Card Reader |
| CR | Columbia Resin |
| CRAC | Computer Room Air Conditioning |
| CRB | Cut Resistant Breaker |
| CRDU | Cluster Remote Display Unit |
| CRI | Color Rendition Index |
| CRN | Computer Registration Number |
| CRS | Cluster Ready Server |
| CRU | Cassette Read Unit |
| CRUSH | Cognitive Radio Universal Software Hardware |
| CS | Compensator Specification |
| CSAC | Chip Scale Atomic Clock |
| CSD | Constant Speed Drive |
| CSF | Cut-off Shifted Fiber |
| CSG | Compatable Stereo Generator |
| CSMA/CA | Carrier Sense Multiple Access/ Collision Avoidance |
| CSMA/CD | Carrier Sense Multiple Access/ Collision Detection |
| CSOC | Configurable System On Chip |
| CSOS | Communications Switch Operating System |
| CSP | Chip Scale Packaging |