Stamp feature, to philatelists

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Possible Answers: PERF.

Random information on the term “PERF”:

The Commission on Accreditation for Law Enforcement Agencies, Inc., (CALEA®) is a credentialing authority (accreditation), based in the United States, whose primary mission is to accredit public safety agencies, namely law enforcement agencies, training academies, communications centers, and campus public safety agencies.
Taken from Wikipedia