Per

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Per or PER can be:

a common first name in Scandinavia. A form of Peter which means "rock" or "cliff" in Latin.
the IOC country code for Peru.
the IATA code for Perth Airport in Western Australia.
PE ratio, price-to-earnings ratio, used in finance.
Player Efficiency Rating, a basketball statistic.
Partial equivalence relation.
Polarization extinction ratio, used in optics and telecommunications.
Per, the gender-neutral possessive pronoun used by the inhabitants of the future feminist and anarchist utopia in Marge Piercy's novel Woman on the Edge of Time.
Packed Encoding Rules, a set of ASN.1 encoding rules for formatting data in binary.
Protein Efficiency Ratio, a method used for evaluating the quality of protein in food.

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