From Wikipedia, the free encyclopedia

Keystone may refer to:

• Keystone (architecture), the stone at the top of an arch
• Keystone (beer brand), a second chance beer from Coors Brewing Company
• Keystone (cask), a wooden or plastic fitting used in ale casks.
• Keystone (software), A parser and front-end for ISO C++
• Keystone correction, corrects for some types of distortion in projectors
• Keystone species, species that have a larger effect on their environment than is purely due to their abundance
• A poetic-theological description of The Book of Mormon
• Keystone Aircraft Corporation
• Keystone Camera Company
• Keystone Kapers, a classic Atari game where a police officer pursues a thief
• Keystone Kops, a series of silent movies
• Keystone module, a type of data connector mounted in walls and patch panels
• Keystone Studios, movie studio
• Keystone Switzerland, a news agency
• Operation Keystone during World War II
• The Keystone asterism in the constellation Hercules
• Keystone National High School, a private correspondence school
• Keystone (1899 automobile), a steam car from Lebanon, Pennsylvania
• Keystone (1914 automobile), an automobile from Pittsburgh
• Keystone School, a private K-12 school in San Antonio, TX
• Keystone at the Crossing, a business/shopping district located in Indianapolis, Indiana
  • The Fashion Mall at Keystone, a mall located in the Keystone shopping district
• The Keystone effect is caused by attempting to project an image onto a surface at an angle, as with a projector sitting on a table, pointing upward at a screen. It can be corrected by some video display technologies, as with NVKeystone by Nvidia.

• Keystone, Colorado, a town and ski resort
• Keystone, South Dakota, a town near Mount Rushmore
• Keystone City, home of the comic book character the Flash
• Keystone Resort, ski resort in Keystone, Colorado
• Keystone State, nickname for the U.S. Commonwealth of Pennsylvania, in use by 1802

• Keystone Service (Amtrak), Amtrak's current New York-Harrisburg
• Keystone (Amtrak), Amtrak's former New York-Pittsburgh service
• Keystone (PRR), Pennsylvania Railroad's former New York-Washington service

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