by projecting an image onto a surface at an angle, or by photography at an angle Keystone Initiative, a medical protocol to reduce infection rates Keystone module, a type of data connector mounted in walls and patch panels Keystone Press Awards Keystone species, species that have a larger effect on their environment than is purely due to their abundance Operation Keystone, during World War II Keystone, a variety of screwdriver blade "Keystone", a descriptive reference to the Book of Mormon The Keystone, journal of the Pennsylvania Railroad Technical and Historical Society The Keystone, Pennsylvania news website owned by Courier Newsroom See also Stone (disambiguation) Key (disambiguation) The Stone Key (2008 novel) post-apocalyptic novel by Isobelle Carmody Stone Key Partners (bank) U.S. boutique investment bank