Per is a

Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...

preposition which means "through" or "for each", as in

per capita ''Per capita'' is a Latin phrase literally meaning "by heads" or "for each head", and idiomatically used to mean "per person". The term is used in a wide variety of social sciences and statistical research contexts, including government statistic ...

. Per or PER may also refer to:

Places

* IOC country code for

Peru , image_flag = Flag of Peru.svg , image_coat = Escudo nacional del Perú.svg , other_symbol = Great Seal of the State , other_symbol_type = National seal , national_motto = "Firm and Happy f ...

* Pér, a village in Hungary * Chapman code for Perthshire, historic county in Scotland

Math and statistics

Rate (mathematics) In mathematics, a rate is the ratio between two related quantities in different units. If the denominator of the ratio is expressed as a single unit of one of these quantities, and if it is assumed that this quantity can be changed systematicall ...

, ratio between quantities in different units, described with the word "per" * Price–earnings ratio, in finance, a measure of growth in earnings *

Player efficiency rating The player efficiency rating (PER) is John Hollinger's all-in-one basketball rating, which attempts to collect or boil down all of a player's contributions into one number. Using a detailed formula, Hollinger developed a system that rates every p ...

, a measure of basketball player performance * Partial equivalence relation, class of relations that are symmetric and transitive * Physics education research

Science

Perseus (constellation) Perseus is a constellation in the northern sky, being named after the Greek mythological hero Perseus. It is one of the 48 ancient constellations listed by the 2nd-century astronomer Ptolemy, and among the 88 modern constellations defined by ...

, standard astronomical abbreviation *

Period (gene) Period (per) is a gene located on the X chromosome of ''Drosophila melanogaster''. Oscillations in levels of both ''per'' transcript and its corresponding protein PER have a period of approximately 24 hours and together play a central role in the ...

or ''per'' that regulates the biological clock and its corresponding protein PER * Protein efficiency ratio, of food * PER or peregrinibacteria, a candidate bacterial phylum

Media and entertainment

* PeR (band), a Latvian pop band * ''Per'' (film), a 1975 Danish film

Transport

* IATA code for

Perth Airport Perth Airport is an international, domestic and general aviation airport serving Perth, the capital city of Western Australia. It is the fourth busiest airport in Australia measured by passenger movements and falls within the boundaries of ...

in Western Australia * National Rail station code for

Penrhiwceiber railway station , symbol_location = gb , symbol = rail , image = Train at Penrhiwceiber station (geograph 5293095).jpg , borough = Penrhiwceiber, Rhondda Cynon Taf , country = Wales , coordinates ...

, Rhondda Cynon Taf, Wales

Other

Per (given name) Per is a Scandinavian masculine given name. It is derived from the Greek word πετρος (petros) meaning "stone" or "rock". The name is a variant of Peter, a common masculine name of the same origin. Other Scandinavian variants of Per are P ...

, a Scandinavian form of Peter * Per (storm), a storm in Sweden, in January 2007 *

Packed Encoding Rules Abstract Syntax Notation One (ASN.1) is a standard interface description language for defining data structures that can be serialized and deserialized in a cross-platform way. It is broadly used in telecommunications and computer networking, an ...