| 項目 |
英語 |
| D1規格 | D1 code |
| DA変換器 | DA converter |
| dB | decibel |
| DBS | direct broadcasting satellite |
| DDC | direct digital control |
| DDX | digital data exchange |
| DfE | Design for Environment |
| DGR | directional ground fault relay |
| DHC | district heating and cooling |
| DO | dissolved oxygen |
| DOP | di-octyl-phtalate |
| DOP法効率 | DOP test efficiecy |
| DPBX | digital private branch exchange |
| DPD法 | DPD chlorimetric method |
| dpi | dot per inch |
| DRAM | Dynamic RAM |
| DS | disconnecting switch |
| DVD | digital video disk、digital versatile disc |
| DVがいし | insulator for DV wire |
| DV電線 | PVC insulated service drop wire |
| DWVシステム | drainage waste and vent system |
| DXコイル | direct expansion coil |
| DX方式 | direct expansion system |
| Dスリップ | D slip |
| D火災 | c1ass D fire |
| D種接地工事 | special class D grounding work（100 ohms and below） |
| D動作 | differential action |