Brain circuitry pattern
From Memory Alpha, the free Star Trek reference.
A brain circuitry pattern, or BCP, is a readout of a patient’s hyperencephalogram, exhibited on a viewscreen as different linear changes of the subject’s brain activity. The BCP is considered a unique characteristic for every individual, akin to fingerprints, making that individual’s hyperencephalogram an important part of his or her medical record. (TOS: "The Lights of Zetar").
