Voiceprint
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A voiceprint is an electronically-recorded representation of a voice in graphical format.
Each voiceprint is unique to the individual speaker. They can sometimes be imitated by voice duplicators, but strong software can detect the deception.
They were commonly used security methods to identify individuals when accessing critical or secured information, including on turbolifts. They had (for the most part) replaced retinal scans between the 21st and 24th centuries. In the 23rd century, a voiceprint was a primary part of the "Steinman analysis method" of comparing someone against their baseline retained in Star Fleet personnel files.
