| 項目 |
英語 |
| UHF | ultra high frequency |
| UL | Underwriters Laboratories |
| ULPAフィルタ | ultra low penetration air filter |
| UPS | uninterruptible power supply system |
| USB | universal sirial bus |
| UTPケーブル | unshielded twisted pair cable |
| UVR | undervoltage relay |
| UV共用形 | UHF-VHF common use |
| Uトラップ | U-trap |
| Uボルト | U-bolt |
| U形ストレーナ | U-shaped strainer |
| U形蛍光ランプ | U-shaped fluorescent lamp |
| U字管マノメータ | U-shape tube manometer |
| U字管型熱交換器 | U-bend heat exchanger |