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Piet (programming language)
Piet is an esoteric, stack-based programming language created by David Morgan-Mar and named after Piet Mondrian, in which a program is an image of colored blocks and instructions depend on color changes between them.
Pieter Abbeel
Pieter Abbeel is a professor of electrical engineering and computer sciences at UC Berkeley who directs the Robot Learning Lab, co-founded Gradescope and Covariant, and joined Amazon as a Scholar in 2024.
Pietro Perona
Pietro Perona is a computer vision researcher and the Allen E. Puckett Professor of Electrical Engineering at Caltech, best known for the anisotropic diffusion equation for filtering image noise.
Piezoelectric actuator
A piezoelectric actuator converts electrical energy into precise mechanical movement via the inverse piezoelectric effect, usually in PZT ceramics, achieving subnanometer positioning and microsecond response.
Piezoelectric bimorph
A piezoelectric bimorph is a bending actuator of two bonded piezoelectric layers that flex oppositely under voltage, converting small strain into large tip deflection for microrobots and sensors.
Piezoelectric fiber composite
A piezoelectric fiber composite is a flexible actuator or sensor made of piezoelectric ceramic fibers in a polymer matrix, best known through NASA's Macro-Fiber Composite of 1999.
PiezoMotor
A piezoelectric motor converts the deformation of a piezoceramic element into rotary or linear motion, achieving sub-nanometer precision and 30 to 100 times the force density of small electromagnetic motors.
Piezoresistive sensor
A piezoresistive sensor measures pressure, force, strain, or acceleration by converting mechanical stress into a resistance change. Widely used in MEMS, its standard form uses four silicon piezoresistors in a Wheatstone bridge.
Piezoresistive tactile sensor
A piezoresistive tactile sensor is a touch sensor that measures pressure or strain through a change in electrical resistance, detecting both the intensity and location of a contact force.
Pig iron
Pig iron, or crude iron, is the high-carbon iron smelted from ore in a blast furnace, too brittle to work directly and mostly refined into steel.
Pigeon post
Pigeon post, also called pigeon mail, is the sending of messages by homing pigeons, used for roughly 3,000 years and most famously to carry mail into besieged Paris in 1870–71.
Pigging
Pigging, or pipeline pigging, is the practice of cleaning and inspecting oil and natural gas pipelines by pushing a device called a pig through with line pressure.
Piggy bank
A piggy bank, also called a money box, is a coin container traditionally shaped like a pig, with a slot for coins and no easy way to remove them.
Pika (AI model)
Pika is a family of text-to-video, image-to-video, and video-editing AI models developed by Pika Labs, founded in 2023, best known for viral one-click effects such as inflate, melt, and cake-ify.
Pike Solar Project
The Pike Solar Project is a 175 MW utility-scale solar plant near Fountain, Colorado, which entered commercial operation in December 2023 and powers about 46,300 homes.
Pikka
Pikka is an oil field and production unit on Alaska's North Slope, developed in the Nanushuk formation by Santos and Repsol, with first oil reached in May 2026.
Pil J. Yoo
Pil Jin Yoo (유필진) is a South Korean chemical engineer and professor at Sungkyunkwan University, trained at Seoul National University and MIT, working on battery materials.
Pilatus Aircraft
Pilatus Aircraft Ltd, also known as Pilatus Flugzeugwerke, is a Swiss aircraft manufacturer founded in Stans in 1939, best known for the PC-12 turboprop and PC-24 business jet.
Pilatus PC-12
The Pilatus PC-12 is a single-engine, pressurized cabin-class turboprop built by Pilatus Aircraft of Stans, Switzerland, first certified in 1994, with over 2,200 delivered worldwide.
Pilatus PC-21
The Pilatus PC-21 is a single-engine turboprop military trainer built by Pilatus Aircraft in Switzerland, designed to take student pilots from basic flying through jet preparation.
Pilatus PC-24
The Pilatus PC-24 is a twin-engine light business jet built by Pilatus Aircraft in Stans, Switzerland, the first business jet designed and certified in Switzerland, entering service in 2018.
Pilatus PC-6 Porter
The Pilatus PC-6 Porter, known as the Pilatus Porter, is a Swiss single-engine STOL utility aircraft built by Pilatus from 1959 to 2022 for short, unprepared, and high-altitude airstrips.
Pilatus PC-7
The Pilatus PC-7 Turbo Trainer is a two-seat turboprop military trainer built by Pilatus Aircraft in Stans, Switzerland, first flown in 1975 and used for basic through tactical flight training.
Pilatus PC-9
The Pilatus PC-9 is a Swiss single-engine, tandem-seat turboprop military trainer developed by Pilatus Aircraft, first flown in 1984, serving worldwide as an advanced trainer and target tug.
Pilatus U-28 Draco
The Pilatus U-28 Draco (U-28A) is a modified Pilatus PC-12 operated by US Air Force Special Operations Command as an ISR platform for special operations forces, fielded in 2006.
Pile driver
A pile driver is a machine that installs piles, the slender elements of deep foundations, by hammering them into the ground for buildings, bridges, and other structures.
Pile driving
Pile driving is the process of installing foundation piles into the ground by impact, vibration, or pressing, most often for bridges, buildings, and offshore wind turbines.
Pile driving analyzer
A pile driving analyzer (PDA) measures force and acceleration at a pile head during hammer impact, estimating pile bearing capacity, driving stresses, and hammer performance.
Pile foundation
A pile foundation is a deep foundation that uses long, slender piles to carry structural loads through weak surface soils down to stronger soil or rock.
Pilgrim nuclear power plant
The Pilgrim nuclear power plant in Plymouth, Massachusetts, was the state's only nuclear plant, operating a boiling water reactor from 1972 until its permanent shutdown in May 2019.