Per is a Latin

preposition Prepositions and postpositions, together called adpositions (or broadly, in traditional grammar, simply prepositions), are a class of words used to express spatial or temporal relations (''in'', ''under'', ''towards'', ''before'') or mark various ...

which means "through" or "for each", as in per capita. Per or PER may also refer to:

Places

* IOC country code for Peru *

Pér Pér is a village in Győr-Moson-Sopron county, Hungary Hungary ( hu, Magyarország ) is a landlocked country in Central Europe. Spanning of the Pannonian Basin, Carpathian Basin, it is bordered by Slovakia to the north, Ukraine to the ...

, a village in Hungary * Chapman code for

Perthshire Perthshire (locally: ; gd, Siorrachd Pheairt), officially the County of Perth, is a historic county and registration county in central Scotland. Geographically it extends from Strathmore in the east, to the Pass of Drumochter in the north, ...

, historic county in Scotland

Math and statistics

* Rate (mathematics), ratio between quantities in different units, described with the word "per" *

Price–earnings ratio The price-earnings ratio, also known as P/E ratio, P/E, or PER, is the ratio of a company's share (stock) price to the company's earnings per share. The ratio is used for valuing companies and to find out whether they are overvalued or under ...

, in finance, a measure of growth in earnings * Player efficiency rating, a measure of basketball player performance *

Partial equivalence relation In mathematics, a partial equivalence relation (often abbreviated as PER, in older literature also called restricted equivalence relation) is a homogeneous binary relation that is symmetric and transitive. If the relation is also reflexive, the ...

, class of relations that are symmetric and transitive *

Physics education research Physics education research (PER) is a form of discipline-based education research specifically related to the study of the teaching and learning of physics, often with the aim of improving the effectiveness of student learning. Approximately ...

Science

* Perseus (constellation), 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 Protein efficiency ratio (PER) is based on the weight gain of a test subject divided by its intake of a particular food protein during the test period. From 1919 until very recently, the PER had been a widely used method for evaluating the quality ...

, of food * PER or peregrinibacteria, a candidate bacterial phylum

Media and entertainment

PeR (band) Per is a Latin preposition which means "through" or "for each", as in per capita. Per or PER may also refer to: Places * IOC country code for Peru * Pér, a village in Hungary * Chapman code for Perthshire, historic county in Scotland Math ...

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

Transport

* IATA code for Perth Airport 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) Cyclone Per was a powerful storm with hurricane-force winds which hit the west coast of Sweden and Norway on the morning of 14 January 2007. In Sweden, six people died from the storm and approximately 300,000 households were left without electrici ...

, 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 ...