A pet is an animal kept primarily for company, protection or entertainment. Pet or PET may also refer to: Science and technology Science Polyethylene terephthalate, a common plastic material in the polyester family Paired-end tag, a short sequence at the end of a DNA fragment Photoinduced electron transfer, a process of electron transfer under action of light Pólya enumeration theorem, a mathematical theorem in enumerative combinatorics Potential evapotranspiration, a measure of the atmospheric demand for water vapour from evaporation and transpiration pET, a series of cloning expression vectors Medicine Patulous Eustachian tube, a medical disorder affecting the middle ear Positron emission tomography, a medical imaging technique Pre-eclampsia, a medical complication of pregnancy Technology Commodore PET (Personal Electronic Transactor), a 1970s era personal computer Personal Energy Transportation, a mobility device for disabled individuals Privacy-enhancing technologies, a general term for a set of computer tools, applications and mechanisms Organizations and businesses Politiets Efterretningstjeneste, the national intelligence security agency of Denmark PET International, non-profit organization that promotes and supports Personal Energy Transportation Pet, Inc., a former American producer of evaporated milk and other food products Pet Airways, an American company specializing in the transportation of pets Arts and entertainment Personal Electronic Thing, part of the player-computer persona communications system in the Starship Titanic video game Personal Terminal (Mega Man), a handheld device used in the Mega Man Battle Network video games Pet (album), an album by Fur Patrol Pet (film), a 2016 American/Spanish psychological thriller Pet (manga), a manga series by Ranjō Miyake Pet (novel), a 2019 young adult speculative fiction novel by Nigerian author Akwaeke Emezi Education Parent Effectiveness Training, a parent education program developed by Thomas Gordon Preliminary English Test, former name of the B1 Preliminary, an examination of English proficiency provided by Cambridge English Psychometric Entrance Test, an Israeli standardized university entrance exam Transport Petts Wood railway station, London, England (National Rail station code) Other uses Pierre Elliott Trudeau (1919–2000), nicknamed PET, former Prime Minister of Canada PET (time), the time zone for Peru Potentially Exempt Transfer, a concept in the inheritance tax code of the United Kingdom Presidential Electoral Tribunal, an electoral tribunal in the Philippines See also Pets (disambiguation)