Unsub stands for "UNknown SUBject". It is used to refer to a suspect in a criminal investigation. The subject is usually suspected of a specific crime; serial killing, rampage killing, arson, etc.
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Criminal Minds Wiki
Unsub stands for "UNknown SUBject". It is used to refer to a suspect in a criminal investigation. The subject is usually suspected of a specific crime; serial killing, rampage killing, arson, etc.