'低频' (dīpín) literally combines '低' (dī), meaning 'low', and '频' (pín), short for '频率' (pínlǜ, 'frequency'). Together, it means 'low-frequency' — referring to sound waves, electromagnetic signals, or vibrations with relatively few cycles per second (typically below 20 Hz for sound). It is commonly used in physics, engineering, acoustics, and biology.

In biology and animal behavior, '低频' often describes vocalizations or sensing mechanisms used by large animals like elephants or whales, which communicate using infrasound (below human hearing range). The term appears in technical discussions about audio equipment, seismic monitoring, and wildlife research. While not a daily conversational word, it's essential in scientific and technical Chinese contexts where precise signal classification matters.