| Abbreviation | Definition |
|---|---|
| CP | Clare Pendar |
| CPWD | Central Public Works Department |
| CR | Collins Radio |
| CRES | Competitive Retail Electric Supplier |
| CS | Commercial Standard (per the USDoC) |
| CS | Control Switch |
| CT | CTS Knights |
| CU | Cutler-Hammer |
| CV | Crown Microwave |
| CW | Continental Winchester |
| CX | Cramer |
| DA | Devian API |
| DE | Dixon Electronics |
| DGSND | Director General of Supplies and Disposals |
| DJB | Delhi Jal Board |
| DL | Dale |
| DMBC | Doncaster Metropolitan Borough Council |
| DMEPOS | Durable Medical Equipment Prosthetic and Orthotic Suppliers |
| DPI | Department of Public Information |
| DPLS | Development Program for Local Suppliers |