Any specific and uniquely identifiable physical human characteristic, e. G. , of the retina, iris, acoustic spectrum of the voice (i.e., voiceprint,) fingerprint (s,) handwriting, pattern of finger lengths, etc. , that may be used to validate the identity of an individual. Note: Biometrics provide a highly secure means of identification, for purposes of security involving, e. G. , Internet communications and cryptosystems.