A quatrefoil (four leaf) is a decorative element of four partially overlapping circles. Quatrefoil may also refer to: Quatrefoil: A Modern Novel, a 1950 book by James Barr Quatrefoil Library, in Minneapolis, Minnesota, U.S. Quatrefoil reentry, a type of cardiac arrhythmia See also Foil (architecture) Trefoil (disambiguation) (three leaf) Cinquefoil (disambiguation) (five leaf) Four-leaf clover