Keystone

Keystone may refer to:

• Keystone (architecture), the 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 correction for these types of distortion

Business

• Keystone Aircraft Corporation, an early manufacturer of airplanes
• Keystone (beer brand), a beer from Coors Brewing Company
• Keystone Camera Company
• Keystone View Company, a US photo agency founded in 1892
• Keystone (steam automobile), a steam car from Lebanon, Pennsylvania
• Keystone (gasoline automobile), an automobile from Pittsburgh
• Keystone Shipping Co., an America Ship transport company

Entertainment

• Keystone (video game), an Xbox Live Arcade casino gambling game
• Keystone Cops, a series of silent movies
• Keystone Kapers, a classic Atari game wherein a police officer pursues a thief
• Keystone Studios, movie studio

Places

United States

• The "Keystone State", the nickname for the U.S. Commonwealth of Pennsylvania, which has been in use since 1802.

• Keystone, Colorado, a town
  • Keystone Resort, the related ski resort
• Keystone, Florida, an unincorporated community
• Keystone, Indiana
• Keystone, Iowa
• Keystone, Montana
• Keystone, Nebraska
• Keystone, South Dakota, a town near Mount Rushmore
• 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
• Keystone Heights, Florida, a small city
• Keystone lake,resort area near Tulsa ,Ok in rural creek county formed by the meeting of the arkansas river and cimarron river. Bald eagles are frequently seen in the hills surrounding the lake and dam.

Fictional

• Keystone City, home of the comic book character the Flash

Railroads

• 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
• Keystone (train), a lightweight train built for the Pennsylvania Railroad on 1956, by the Budd Company

Schools

• Keystone School, a private K-12 school in San Antonio, Texas
• Keystone National High School, a private correspondence school

Other uses

• Keystone (cask), a wooden or plastic 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 Hercules (constellation)
• Keystone (limestone), a type of limestone quarried in the Florida Keys
• The keystone variety of slotted screwdriver blade
• Keystone Initiative, a medical protocol based on a 2003 Michigan study involving intervention at over 100 Intensive care units (ICUs) to successfully reduce infection rates
• Keystone pricing, a description of retail pricing whereby the consumer price is exactly double the wholesale price