Principia
Principia means:
- Principia (staff building) , the staff building in Roman military camps
- The System of the World , book by Neal Stephenson, see Baroque cycle # "Principia"
- Principia (bicycle brand) , Danish bicycle brand
- (2653) Principia , asteroid of the inner main belt
the short form for the following books:
- Philosophiae Naturalis Principia Mathematica by Isaac Newton (1687)
- Principia mathematica by Bertrand Russell and Alfred North Whitehead (1910–1913)
- Principia Discordia , a collection of satirical religious texts (1963)
