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Perkins Engines
Perkins Engines, formally Perkins Engines Company Limited, is a British diesel and gas engine manufacturer founded in Peterborough in 1932, owned by Caterpillar since 1998.
Perl
Perl is a general-purpose programming language created by Larry Wall and first released in 1987, best known for powerful text processing and its Comprehensive Perl Archive Network (CPAN).
Perla Oil and Gas Field
Perla is a giant natural gas and condensate field in shallow waters of the Gulf of Venezuela, discovered by Repsol and Eni in 2009 and producing since July 2015.
Perlan Project
The Perlan Project is a US nonprofit that flies engineless gliders into the stratosphere on mountain waves, setting a 76,124-foot glider altitude record in 2018 over Argentina.
Perlmutter (supercomputer)
Perlmutter, named for Nobel laureate Saul Perlmutter, is an HPE Cray EX supercomputer at NERSC in Berkeley, California, reaching 113 petaflops and serving over 11,000 scientists.
Perm GRES power station
The Perm GRES power station (Пермская ГРЭС) is a gas-fired thermal power station at Dobryanka in Perm Krai, Russia, and the largest electricity supplier in Perm Territory.
Permalink
A permalink is a permanent URL intended to identify a specific web resource, most commonly an individual blog post, in a form that never changes as surrounding content is updated.
Permalloy
Permalloy is a family of soft magnetic nickel–iron alloys, typically about 80% nickel and 20% iron, valued for very high permeability and used in magnetic shielding and sensors.
Permanent account number
The permanent account number (PAN) is a ten-character identifier issued by the Indian Income Tax Department, issued as a laminated PAN card or electronic e-PAN and valid for the holder's lifetime.
Permanent jewellery
Permanent jewelry, also called welded or forever jewelry, is claspless chain jewelry custom-fitted to the wearer and welded closed, popularized by brands like Catbird in New York in the 2010s.
Permanent magnet generator
A permanent magnet generator (PMG) is an electrical machine that generates alternating or direct current from permanent magnets in its rotor, needing no external excitation current and no brushes.
Permanent magnet synchronous generator
A permanent magnet synchronous generator (PMSG) is a synchronous generator whose rotor field comes from permanent magnets instead of a wound field, widely used in wind turbines.
Permanent magnet synchronous motor
A permanent magnet synchronous motor (PMSM) is an AC motor with permanent-magnet rotors that runs at synchronous speed, up to 10 percentage points more efficient than induction motors and dominant in electric vehicles.
Permanent mold casting
Permanent mold casting is a casting process in which molten metal fills a reusable steel mold by gravity, low pressure, vacuum, or centrifugal pressure, used for nonferrous alloys.
Permeable interlocking concrete pavement
Permeable interlocking concrete pavement (PICP) is a stormwater management pavement built from concrete pavers with open, aggregate-filled joints over a crushed stone base that stores and infiltrates runoff.
Permeable paving
Permeable paving, also called porous pavement, lets rainwater pass through the surface into soil and gravel instead of running off; types include porous asphalt and pervious concrete.
Permian Express Oil Pipeline
The Permian Express Oil Pipeline is a crude oil pipeline system carrying Permian Basin crude from West Texas to Gulf Coast terminals and to Cushing, Oklahoma.
Permian Highway Pipeline
The Permian Highway Pipeline is a natural gas pipeline in Texas, carrying Permian Basin gas from the Waha hub to Katy since entering service in January 2021.
Permian Resources
Permian Resources is an independent oil and gas exploration and production company headquartered in Midland, Texas, formed in 2022 and focused on the Delaware Basin of the Permian Basin.
Permissive license
A permissive license is an open-source software license that allows free use, modification, and redistribution, including in proprietary works, with minimal obligations like retaining notices.
Permutation feature importance
Permutation feature importance, or permutation importance, is a model-agnostic machine learning technique, introduced by Leo Breiman in 2001, that measures feature importance by shuffling values and observing the drop in model performance.
PERN (company)
PERN S.A. is a Polish state-controlled oil and fuel logistics company headquartered in Płock, whose 2,558 km of pipelines supply refiners in Poland and Germany.
Peroá Gas Field
The Peroá Gas Field is an offshore natural gas field in the Espírito Santo Basin, Brazil, about 52 kilometers off Linhares, producing from a fixed platform since 2006.
Perodua
Perodua (Perusahaan Otomobil Kedua) is Malaysia's second national carmaker, established in 1993 with Daihatsu and now the country's sales leader with roughly 44 percent of the market.
Perodua Myvi
The Perodua Myvi is a five-door subcompact hatchback produced by Malaysia's Perodua since May 2005, based on the Daihatsu Boon and long the country's best-selling car.
Perodua QV-E
The Perodua QV-E is a battery electric hatchback produced by Malaysian carmaker Perodua, launched in December 2025 as the company's first electric vehicle and Malaysia's first homegrown one.
Perovskite encapsulation
Perovskite encapsulation is the sealing of perovskite solar cells in barrier materials, usually glass with a polymer layer and edge seal, to protect them from moisture and heat.
Perovskite field-effect transistor
A perovskite field-effect transistor (PeFET) is a transistor whose channel is built from a metal halide perovskite, first reported by IBM in 1999 for logic circuits and photodetectors.
Perovskite laser
Perovskite lasers are semiconductor lasers that use metal halide perovskites as the gain medium. First demonstrated in 2014, they are studied for displays, optical communications, and photonic chips.
Perovskite light-emitting diode
Perovskite light-emitting diodes (PeLEDs) are LEDs with a metal halide perovskite emissive layer. Since 2014 their efficiencies have exceeded 30%, making them candidates for next-generation displays.