The unit for wavelength is typically represented by the symbol λ (lambda) and is measured in meters (m) or its submultiples such as nanometers (nm) or angstroms (Å). In scientific and engineering contexts, wavelengths are often expressed in meters or their decimal multiples (e.g., millimeters, micrometers) depending on the scale of the phenomenon being studied. In other cases, particularly in optics and spectroscopy, shorter wavelengths are commonly expressed in nanometers or angstroms for convenience.