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The word quatrefoil etymologically means "four leaves", and applies to general four-lobed shapes in various contexts.

Contents 1 In heraldry 2 In architecture/symbolism 3 Military 4 Sorority 5 Four-leaf clover 6 External links 7 References

In heraldic terminology, a quatrefoil is a representation of a flower with four petals, or a leaf with four leaflets (such as a four-leaf clover). It is sometimes shown "slipped", i.e. with an attached stalk. However, it is not defined as a flower, but called a "foil".

In architecture and traditional Christian symbolism, a quatrefoil is a symmetrical shape which forms the overall outline of four partially-overlapping circles of the same diameter. Two common types of quatrefoil are shown in the first two images below (click on the images for larger illustrations, and explanation of the geometry involved):

With more overlap

With less overlap

Combined with square

The quatrefoil enjoyed its peak popularity during the Gothic Revival and Renaissance, but can still be seen on countless churches and cathedrals today. It is most commonly found as tracery, mainly in Gothic architecture, where a quatrefoil can often be seen at the top of a Gothic arch, sometimes with stained glass on the interior.

In art, the quatrefoil is a type of decorative framework (mainly used in engraving), consisting of an architectural quatrefoil combined with a square (just as the trefoil is often combined with an equilateral triangle), as seen in the image on the right above. This version of the quatrefoil is geometrically notable also for its equivalence to four overlapping hearts, with each heart rotated 90 degrees. Among the most famous works of art employing the quatrefoil are bronze panels on the North Doors of the Baptistery in Florence by Lorenzo Ghiberti (also Filippo Brunelleschi's equally famous competition entry for the same doors, The Sacrifice of Isaac) and "Head of an Angel" by Piero della Francesca.

The word quatrefoil can also refer to a four-pointed decoration on the top of a warrant or commissioned Marine officer's dress and service caps. Tradition tells that the design was first used on sailing ships so that Marine sharpshooters in the rigging did not shoot their own officers on the deck.

The quatrefoil is also the national symbol of the women's fraternity Phi Mu (a member of the National Panhellenic Conference.)

The four-leaf clover is a symbol of good luck.

• Pictures of Ghiberti's and Brunelleschi's quatrefoils

• The Artist Blacksmith, Volume 5, Number 4. www.Artist-Blacksmith.org.
• The Artist Blacksmith, Volume 6, Number 1, 2 & 3.
• The Hammers Blow, Volume 6, Number 4.