| Subject | English | Japanese |
| vac.tub. | threshold frequency | 限界振動数 |
| phys. | threshold frequency | 限界周波数 (genkai-shūhasū) |
| radio | sensitivity threshold of automatic frequency control | 自動周波数制御のしきい値 |
| radio | sensitivity threshold of automatic frequency control | 自動周波数制御の感度しきい値 |