| Abbreviation | Definition |
|---|---|
| DBH | Diameter Breast Height |
| dBI | Decibels referenced to Isotropic gain |
| DBL | Double |
| dBm | Decibel relative to one milliwatt |
| DBSD | DB of Spectral Density |
| DBU | Dialog Base Units |
| DC | Digital Counts |
| DCV | Direct Current Volts |
| DD | Decimal Degrees |
| ddmmyy | day month year |
| deca- | a prefix meaning times 10 |
| deci- | a prefix meaning 1/10th |
| deg | degree |
| DEG | Degrees |
| DHMS | Days, Hours, Minutes, Seconds |
| DHV | Design Hour Volume |
| DIAM. | Diameter |
| DIF | Difference In Fahrenheit |
| DIM | Device Interface Module |
| DIPS | Ductile Iron Pipe Size |