Per or PER may refer to:

Places

Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...

(IOC country code) * Pér, a village in Hungary *

Perthshire Perthshire (Scottish English, locally: ; ), officially the County of Perth, is a Shires of Scotland, historic county and registration county in central Scotland. Geographically it extends from Strathmore, Angus and Perth & Kinross, Strathmore ...

(Chapman code), historic county in Scotland

Science and technology

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

* Packed Encoding Rules, in computing, an ASN.1 wire format * Per (storm), a January 2007 storm in Sweden

Mathematics

Rate (mathematics) In mathematics, a rate is the quotient of two quantities, often represented as a fraction. If the divisor (or fraction denominator) in the rate is equal to one expressed as a single unit, and if it is assumed that this quantity can be changed s ...

, ratio between quantities in different units *

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 unde ...

, in finance, a measure of growth in earnings * Player efficiency rating, a measure of basketball player performance * Partial equivalence relation, class of relations that are symmetric and transitive

Science

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

(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 t ...

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 or PER may refer to: Places * Peru (IOC country code) * Pér, a village in Hungary * Perthshire (Chapman code), historic county in Scotland Science and technology * Physics education research * Packed Encoding Rules, in computing, an ASN.1 ...

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

Transport

Perth Airport Perth Airport is an international airport, international, domestic airport, domestic and general aviation airport serving Perth, Western Australia. It is the List of the busiest airports in Australia, fourth busiest airport in Australia meas ...

(IATA code), in Western Australia *

Penrhiwceiber railway station Penrhiwceiber railway station () serves the village of Penrhiwceiber, Rhondda Cynon Taf, Wales. It is located on the Aberdare branch of the Merthyr Line between the town of Mountain Ash and the village of Abercynon. Passenger services are ...

(National Rail station code), Rhondda Cynon Taf, Wales

Other uses

Per (given name) Per is a Scandinavian masculine given name. It is derived from Greek , ''Petros'' (an invented, masculine form of Greek '' petra,'' the word for "rock" or "stone"). The name is a variant of Peter, a common masculine name of the same origin. Othe ...

, a Scandinavian form of Peter *

Per sign The per sign is a rare symbol used to indicate a ratio. In English, it can replace the word "per" in phrases such as miles per hour ("miles ⅌ hour"). Unicode The Unicode Unicode or ''The Unicode Standard'' or TUS is a character ...

(⅌), a symbol used to indicate a ratio