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Principia may refer to: Philosophiæ Naturalis Principia Mathematica, Isaac Newton's three-volume work about his laws of motion and universal gravitation Principia ( "primary buildings"), the headquarters at the center of Roman forts () The Principia, an educational institution for Christian Scientists in the St. Louis, Missouri, area Principia College, a private four-year college in Elsah, Illinois Principia School, a school from early childhood to high school in the St. Louis, Missouri, area Principia (alga), a stem-group coralline alga Principia, the former name of Zope, the "Z Object Publishing Environment" 2653 Principia, an asteroid named after Newton's work The Principia (book), by Emanuel Swedenborg Principia Mathematica, a three-volume work on the foundations of mathematics by Bertrand Russell and Alfred North Whitehead Principia Ethica, a book on ethics by G. E. Moore Principia Discordia, a Discordian religious text by Greg Hill (Malaclypse the Younger) and Kerry Wendell Thornley (Lord Omar Khayyam Ravenhurst) Principia, astronaut Tim Peake's mission as part of the Expedition 46 crew of the International Space Station "Principia" (Agents of S.H.I.E.L.D.), season 5 episode 13 of Marvel's Agents of S.H.I.E.L.D.