Bioelectric patterns or bioelectrical patterns were detectable life sign signatures produced by living organisms.
In 2369, Lieutenant Commander Data was able to determine that an alien disguised as a Romulan originated from another time continuum, due to the alien's bioelectric patterns existing in a state of temporal flux. (TNG: "Timescape")
In 2371, the USS Voyager crew detected three bioelectrical patterns inside a photonic lattice – the patterns of their three missing crewmembers Chakotay, Tuvok, and Harry Kim. (VOY: "Heroes and Demons")