| Abbreviation | Definition |
|---|---|
| DB-25 | 25-pin D-SUB (series D subminiature) connector |
| DB9 | D-shell connector - One of the family of connectors: The "D" is the shape of the shell, the next letter determines connector size, and the number is the maximum pin count. |
| DBA | Decibels Adjusted |
| DBA | Dynamic Bandwidth Allocation |
| DBBS | Digital Bass Boost System |
| DBCI | Double Bulk Current Injection |
| DBD | Di-electric Barrier Discharge |
| DBIE | Dielectric Breakdown Induced Epitaxy |
| DBMS | DataBase Management System |
| DBO | Dynamic Balancing Overhaul |
| DBR | Distributed Bragg Reflector |
| DBRT | Double Barrier Resonant Tunneling |
| DBS | Direct Broadcast Satellite |
| DBS | Dynamic Bass System |
| DBSS | Diphone Based Speech Synthesis |
| DBW | Drive By Wire |
| dBZ | Decibels of equivalent reflectivity (Z) |
| DC | Direct Current |
| DC | Don't Care |
| DC | Dual Control |