The symbol "λ" (lambda) represents wavelength, which is the distance between consecutive peaks or troughs in a wave. Wavelength is a key characteristic of waves, including those in the electromagnetic spectrum, such as light and radio waves. It is typically measured in meters and is inversely related to frequency; as wavelength increases, frequency decreases. Wavelength plays a crucial role in various fields, including physics, engineering, and music. In sound waves, for example, different wavelengths correspond to different pitches. Understanding wavelength helps in applications like telecommunications and optics, where it influences how waves interact with materials and how they are transmitted.