Keystone or key-stone or ''variation'', may refer to: * Keystone (architecture), a central stone or other piece at the apex of an arch or vault * Keystone (cask), a fitting used in ale casks

Business

Keystone Law Keystone Law (formerly Lawyers Direct; operating in Australia as Keypoint Law) is a national law firm headquartered in London, United Kingdom, with offices in several other countries, which offers legal services for business and individuals. The ...

, a full-service law firm * Digital Keystone, a developer of digital entertainment software * Keystone Aircraft Corporation * Keystone Bridge Company, an American bridge building company * Keystone (beer brand) *

Keystone Camera Company The Keystone Camera Company was an American manufacturer of consumer photographic equipment that began in 1919 in Boston. Notable products were Movie cameras, 126 and 110 110 may refer to: *110 (number), natural number *AD 110, a year *110 B ...

Keystone (gasoline automobile) Keystone was used as the marque of two brass era automobile companies. History The Keystone and Keystone Six were built for the Munch-Allen Motor Car Company of DuBois, Pa. Howard Motor Works in Yonkers, NY, built the first thirty cars before ...

Keystone (steam automobile) The Keystone Steamer was an American automobile manufactured from 1899 until 1900 in Lebanon, Pennsylvania. History Keystone Match & Machine Company was founded in 1894 and offering bicycles from 1896. In 1899 the company offered an interesti ...

* Keystone Pipeline, a crude oil pipeline * Keystone-SDA/Keystone-ATS, a Swiss press agency * Keystone View Company, a US photo agency *

Keystone (Berkeley, California) The Keystone, also known as Keystone Berkeley, was a small music club at 2119 University Avenue in Berkeley, California, which operated in the 1970s and 1980s. Numerous nationally known groups performed there, including Tom Petty and the Heartbrea ...

, a defunct music club

Entertainment

* ''Keystone'' (video game), part of the Xbox Live Arcade title ''Fable 2 Pub Games'' * Keystone (band), led by jazz trumpeter

Dave Douglas David or Dave Douglas may refer to: Entertainment * David Douglas (director) (born 1953), Canadian cinematographer, director and writer * Dave Douglas (trumpeter) (born 1963), American jazz trumpeter * Dave Douglas (drummer) (born 1979), America ...

** ''Keystone'' (album), a 2005 album by the band * Keystone Cops, a silent movie series * ''

Keystone Kapers ''Keystone Kapers'' is a video game developed by Activision and published for the Atari 2600 in April 1983, and later ported to the Atari 5200, Atari 8-bit family, ColecoVision, and in 1984, MSX. Inspired by Mack Sennett's slapstick ''Keystone Co ...

'', a classic Atari game *

Keystone Studios Keystone Studios was an early film studio founded in Edendale, California (which is now a part of Echo Park) on July 4, 1912 as the Keystone Pictures Studio by Mack Sennett with backing from actor-writer Adam Kessel (1866–1946) and Charle ...

, a movie studio

Places

* The Keystone asterism in the Hercules constellation

United States

* The "Keystone State", nickname for the U.S. Commonwealth of Pennsylvania *

Keystone, Colorado Keystone is an unincorporated community and a census-designated place (CDP) located in and governed by Summit County, Colorado, United States. The CDP is a part of the Breckenridge, CO Micropolitan Statistical Area. The population of the Key ...

, a town ** Keystone Resort, the related ski resort * Keystone, Florida, an unincorporated community * Keystone, Indiana * Keystone, Iowa * Keystone, Nebraska * Keystone, North Dakota * Keystone, Ohio *

Keystone, South Dakota Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States. The population was 240 at the 2020 census. It had its origins in 1883 as a mining town, and has since transformed itself into a resort town, servin ...

, a town near Mount Rushmore *

Keystone, Wyoming Keystone is an unincorporated community in Albany County, Wyoming Wyoming () is a U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Montana to the north and northwest, South ...

* Keystone at the Crossing, a business/shopping district in Indianapolis, Indiana ** The Fashion Mall at Keystone, located in the Keystone shopping district * Keystone Heights, Florida *

Keystone Canyon Keystone Canyon is a gorge near Valdez in the U.S. state of Alaska. Situated at an elevation of , its walls are almost perpendicular. It measures in length, connecting the upper and lower valleys of Lowe River. Geography In Keystone Canyon, the ...

, Alaska * Keystone Lake, a resort area near Tulsa, Oklahoma * Keystone, Wisconsin

Canada

* The "Keystone Province", a nickname for the Province of Manitoba ** Keystone Centre, an arena and exhibition centre in Brandon, Manitoba

Fictional locations

* Keystone City, home of the comic book character The Flash * Keystone City, a holographic city in the ''Star Trek: The Next Generation'' episode "

Emergence In philosophy, systems theory, science, and art, emergence occurs when an entity is observed to have properties its parts do not have on their own, properties or behaviors that emerge only when the parts interact in a wider whole. Emergence ...

Railroads

* Keystone Corridor, a rail corridor from Philadelphia to Pittsburgh * ''

Keystone Service Amtrak's ''Keystone Service'' provides frequent regional rail, regional passenger train service between the Harrisburg Transportation Center in Harrisburg, Pennsylvania, and 30th Street Station in Philadelphia, running along the Philadelphia to ...

'', a current New York-Harrisburg service ** ''Keystone'' (Amtrak train, 1979-1981), a predecessor of the current service * ''Keystone'' (Amtrak train, 1971-1972), a former New York-Pittsburgh service operated by Amtrak * ''Keystone'', a former New York-Washington service operated by the

Pennsylvania Railroad The Pennsylvania Railroad (reporting mark PRR), legal name The Pennsylvania Railroad Company also known as the "Pennsy", was an American Class I railroad that was established in 1846 and headquartered in Philadelphia, Pennsylvania. It was named ...

** ''Keystone'' (train), a lightweight train used for the service

Schools

* Keystone School, a private K-12 school in San Antonio, Texas, USA *

Keystone National High School Keystone National High School is a private correspondence and online distance high school based in Pennsylvania, United States. Students can earn their high school diploma at Keystone or take courses to supplement another high school or homeschool p ...

, a private correspondence school *

Keystone Exam The Keystone Exam is a Pennsylvania standardized test administered to the public schools of Pennsylvania, United States. The test has been developed by the Commonwealth of Pennsylvania Department of Education. Since the 2012–2013 school year, the ...

, a Pennsylvania standardized test

Sports

Keystone Junior Hockey League The Keystone Junior Hockey League (KJHL) is a Junior 'B' ice hockey league in the province of Manitoba, Canada. The league, sanctioned by Hockey Manitoba, was formerly known as the Manitoba Junior 'B' Hockey League. History The KJHL champion ...

, in Manitoba * Keystone Cup, Western Canadian Junior "B" ice hockey championship * Keystone (horse), a racehorse

Other uses

Keystone (limestone) Keystone is a type of limestone, or coral rag, quarried in the Florida Keys, in particular from Windley Key fossil quarry, which is now a State Park of Florida. The limestone is Pleistocene in age, and the rock primarily consists of sclera ...

, quarried in the Florida Keys * Keystone effect, caused by projecting an image onto a surface at an angle, or by photography at an angle *

Keystone Initiative Peter J. Pronovost (born February 22, 1965) is Chief Quality and Transformation Officer at University Hospitals Cleveland Medical Center, the main affiliate of the Case Western Reserve University School of Medicine. At UH, Pronovost is responsible ...

, a medical protocol to reduce infection rates * Keystone module, a type of data connector mounted in walls and patch panels *

Keystone Press Awards The Keystone Press Awards are a prominent series of awards presented by the Pennsylvania Newspaper Association to Pennsylvania journalists whose work displays "relevance, integrity and initiative in serving readers, and furthers First Amendment ...

Keystone species A keystone species is a species which has a disproportionately large effect on its natural environment relative to its abundance, a concept introduced in 1969 by the zoologist Robert T. Paine. Keystone species play a critical role in maintaini ...

, species that have a larger effect on their environment than is purely due to their abundance *

Operation Keystone During World War II, Operation Keystone was a Special Air Service patrol consisting of a number of jeep-mounted and airborne teams that operated south of IJsselmeer in the central Netherlands ) , anthem = ( en, "William of Nassau") , ...

, during World War II * Keystone, a variety of screwdriver blade * "Keystone", a descriptive reference to the Book of Mormon