Quatrefoil
（重定向自Quarterfoil）
In art, architecture, and traditional Christian symbolism, the quatrefoil is a type of decorative framework consisting of a symmetrical shape which forms the overall outline of four partially overlapping circles of the same diameter. The word quatrefoil means "four leaves", from Latin quattuor, four, plus folium, a leaf.) and applies to general four-lobed shapes in various contexts. It is also used as a heraldic charge.