| 項目 |
英語 |
| OAダクト | outside air duct |
| OAフロア | raised floor |
| OA対応照明器具 | reflected glare controlled luminaires for VDT |
| OA用二重床 | - |
| OCB | oil circuit breaker |
| OC電線 | outdoor cured polyethylen insulated wire |
| ODP | Ozone layer depletion potential |
| OE電線 | outdoor polyethylene insulated wire |
| OFケーブル | oil-filled paper insulated lead sheathed cable |
| OF式変圧器 | oil filled transformer |
| OMソーラーハウス | - |
| ORP | oxidation reduction potential |
| OS | operating system |
| OW電線 | PVC insulated outdoor weatherproof wire |
| Oリング | O ring |