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

Business

• Digital Keystone, Inc., 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 System, 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 Kops, 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, Los Angeles County, California
• Keystone, Tuolumne 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 Service (Amtrak), a current New York-Harrisburg service
• Keystone (Amtrak), a former New York-Pittsburgh service
• Keystone, Pennsylvania Railroad's former New York-Washington service
• Keystone (train), a lightweight train built for the Pennsylvania Railroad
• A train operated by Amtrak as part of its former Clocker 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
• Keystone International Schools, a private school in Istanbul, Turkey

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