Keystone
Keystone may refer to:
- Keystone (architecture), a central stone or other piece at the apex of an arch or vault
- The keystone effect, caused by projecting an image onto a surface at an angle, or by photography at an angle
- Keystone (cask), a fitting used in ale casks
- Keystone module, a type of data connector mounted in walls and patch panels
- Keystone species, species that have a larger effect on their environment than is purely due to their abundance
- Operation Keystone during World War II
- The Keystone asterism in the Hercules constellation
- Keystone Press Awards
- Keystone (limestone), quarried in the Florida Keys
- Keystone, a variety of screwdriver blade
- Keystone Initiative, a medical protocol to reduce infection rates
- Keystone Bituminous Coal Ass'n v. DeBenedictis, a leading American Supreme Court case on regulatory taking
Business
- Keystone Law, 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
- Keystone (gasoline automobile)
- Keystone (steam automobile)
- Keystone Pipeline, a crude oil pipeline
- Keystone View Company, a US photo agency
- Keystone (Berkeley, California), 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
- Keystone Cops, a silent movie series
- Keystone Kapers, a classic Atari game
- Keystone Studios, a movie studio
In fiction
- Keystone City, home of the comic book character The Flash
- Keystone City, a holographic city in the Star Trek: The Next Generation episode "Emergence"
Places
United States
- The "Keystone State", nickname for the U.S. Commonwealth of Pennsylvania
- Keystone, Imperial County, California
- Keystone, Colorado, a town
- Keystone Resort, the related ski resort
- Keystone, Florida, an unincorporated community
- Keystone, Indiana
- Keystone, Iowa
- Keystone, Nebraska
- Keystone, North Dakota
- Keystone, South Dakota, a town near Mount Rushmore
- 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, Alaska
- Keystone Lake, a resort area near Tulsa, Oklahoma
Canada
- The "Keystone Province", a nickname for the Province of Manitoba
- Keystone Centre, an arena and exhibition centre in Brandon, Manitoba
Railroads
- Keystone Corridor, a rail corridor from Philadelphia to Pittsburgh
- Keystone Service, 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
- 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, a private correspondence school
- Keystone Exam, a Pennsylvania standardized test
Sports
- Keystone Junior Hockey League, in Manitoba
- Keystone Cup, Western Canadian Junior "B" ice hockey championship
Religion
- "Keystone", a descriptive reference to the Book of Mormon
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