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.
The quatrefoil enjoyed its peak popularity during the Gothic and Renaissance eras. It is most commonly found as tracery, mainly in Gothic architecture, where a quatrefoil often may be seen at the top of a Gothic arch, sometimes filled with stained glass.
The quatrefoil is also the national symbol of the women's fraternity Phi Mu (a member of the National Panhellenic Conference).
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