- 简谐振动 jiǎnxiézhèndòng simple harmonic oscillationsimple harmonic oscillation; sinusoidal oscillation
- 简谐波 jiǎnxiébō simple harmonic wavesimple harmonic wave; sine wave
- 简谐运动 jiǎnxiéyùndòng simple harmonic motionsimple harmonic motion in mechanics; the regular back-and-forth movement of an object like a simple pendulum