unsub
 n.— «Unsub is shorthand for “unknown subject,” meaning the person believed to have committed the crimes. Nor is it new. There was a 1989 series called Unsub, which followed a government unit investigating serial killers.» —“‘Unsub’ unmasked and other TV queries” by R.D. Heldenfels Akron Beacon Journal (Ohio) Apr. 6, 2006. (source: Double-Tongued Dictionary)

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