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Pennsylvania-class cruiser
The Pennsylvania-class cruiser was a class of six large armored cruisers built for the United States Navy in the early 1900s, among the world's largest when completed.
Penny-farthing
The penny-farthing, also called the high wheel or ordinary, is an early bicycle with a huge front wheel, popular from the 1870s to the 1880s.
Pennzoil
Pennzoil is an American brand of motor oil and automotive lubricants, first registered as a trademark in 1916 and now one of the best-known motor oil brands in North America, owned by Shell since 2002.
Pensando
Pensando, formally Pensando Systems, is an American data center networking company founded in 2017 by four former Cisco executives and acquired by AMD in 2022 for about $1.9 billion.
Penshurst Place
Penshurst Place, a fortified medieval manor house near Tonbridge, Kent, built in 1341 for Sir John de Pulteney and home to the Sidney family since Edward VI's 1552 grant, with Grade I house and registered Grade I park and gardens.
Penske Truck Leasing
Penske Truck Leasing is an American transportation services company founded by Roger Penske in 1969 and headquartered in Reading, Pennsylvania, providing truck leasing, rental, maintenance, and logistics services.
Penstock
A penstock is a pressurized closed conduit that carries water from a reservoir, canal, or surge tank to a hydroelectric turbine, usually made of steel for high heads.
Pentaho
Pentaho is a Java-based business-intelligence and data-integration software suite combining ETL, reporting, OLAP analysis, and data mining; founded in 2004, it has been owned by Hitachi Vantara since 2017.
Pentamode metamaterials
Pentamode metamaterials, sometimes called meta-fluids, are artificial solids that behave mechanically like liquids, resisting compression but deforming freely under shear; they were first theorized in 1995.
Pentax
Pentax is a camera brand owned by Ricoh Imaging, tracing to the 1919 founding of Asahi Optical in Tokyo and known for its single-lens reflex cameras.
Penthouse apartment
A penthouse apartment, also called a penthouse suite, occupies the top floor of a building and is typically the most expensive residential real estate in many cities.
Pentium
Pentium, or Intel Pentium, is a brand of x86 microprocessors introduced by Intel in March 1993 as its fifth-generation line, later a budget tier, replaced by the Intel Processor brand in 2023.
Pentium (original)
The original Pentium, known by its Intel code name P5, is a fifth-generation x86 microprocessor Intel announced in March 1993 as the successor to the i486.
Pentium 4
The Pentium 4, also known as Pentium IV, is a line of Intel x86 desktop processors introduced in November 2000 on the NetBurst microarchitecture and built for high clock speeds.
Pentium Dual-Core
Intel Pentium Dual-Core was a processor brand used from 2007 to 2008 for budget dual-core CPUs with lower clock speeds and less L2 cache than the Core 2 Duo.
Pentium FDIV bug
The Pentium FDIV bug, also called the Pentium divide bug, was a 1994 hardware defect in early Intel Pentium processors' floating-point division, found by Thomas Nicely and leading to a recall.
Pentium II
The Pentium II, also known as Pentium 2, is an Intel x86 microprocessor introduced in 1997, combining the Pentium Pro's P6 core with MMX technology in a Slot 1 cartridge.
Pentium III
Pentium III, also known as Pentium 3, is a line of x86 microprocessors Intel introduced in 1999 as successor to the Pentium II, distinguished by its new SSE instructions.
Pentose fermentation
Pentose fermentation is the microbial conversion of five-carbon sugars, chiefly xylose and arabinose, into ethanol, allowing lignocellulosic biomass to be used for fuel alcohol production.
Penuelas LNG Terminal
The Peñuelas LNG Terminal is a liquefied natural gas import and regasification terminal in Peñuelas, Puerto Rico, opened in 2000 and owned and operated by EcoEléctrica.
People Inc.
People Inc., formerly Dotdash Meredith, is one of the largest American digital and print publishers, whose more than 40 brands, including PEOPLE and Allrecipes, reach 175 million people monthly.
People mover
A people mover, or automated people mover, is a driverless transit system of small vehicles on a fixed guideway, used mainly at airports and amusement parks.
People's Liberation Army Naval Air Force (中国人民解放军海军航空兵)
The People's Liberation Army Naval Air Force (中国人民解放军海军航空兵) is the aviation branch of China's PLA Navy, founded in the early 1950s and refocused on carrier aviation.
PeopleBot
PeopleBot is a human-scaled mobile robot platform built by ActivMedia Robotics, first shipped in 2000, sharing the Pioneer 2 architecture and widely used in human-robot interaction research.
Peoples Natural Gas
Peoples Natural Gas is a rate-regulated natural gas utility serving about 700,000 customers in Pittsburgh and 18 counties of southwestern Pennsylvania, a subsidiary of Essential Utilities since 2020.
PeopleSoft
PeopleSoft is a family of web-based enterprise business applications covering human resources, finance, supply chain, and campus operations, developed and supported by Oracle since its acquisition in 2004.
Pep Boys
Pep Boys, also known as Manny, Moe & Jack, is an American automotive service and tire chain founded in Philadelphia in 1921 and sold to Mavis in 2026.
Pepco Holdings
Pepco Holdings was an American utility holding company in Washington, D.C., parent of Pepco, Delmarva Power, and Atlantic City Electric, acquired by Exelon in 2016.
Pepper spray
Pepper spray, also known as oleoresin capsicum (OC) spray, is a less-lethal chemical irritant made from chili pepper extract that causes intense burning, eye closure, and breathing difficulty.
Pepper-box
The pepper-box, or pepperbox, is a multibarrel handgun with three or more rotating barrels fired in sequence, popular in America and Europe before Colt's revolver.